Boiler Thiab Siab Hlais Hlau Hlau Phajyog siv rau ntau daim ntawv thov uas lub siab sab hauv yog siab dua li cov roj ntsha uas tau tsim los rau ntau cov roj ntsha uas tau siv ntau dua thiab muaj lwm lub nkoj uas muaj cov roj lossis kua ntawm siab.
Gnee Steel lub tseem ceeb boiler thiab siab rau lub nkoj ntawm qib steel: ASTM A204 / AN287, ASM9GH, P690Qhgh, Q345r, 15mo3.
ASTM A202 / A202M
ASTM A202 / A202M yog cov qauv qhia tshwj xeeb rau cov hlab ntsha siab, aliroth {{} {2} {2 {2} {
| ASTM A202 Qib A | ASTM A202 Qib B |
ASTM A203 / A203M
ASTM A203 / AN203M Txuj Ci Cov Qauv Kev Ntsuas Cov Hlau Siab, Alloy Hlau Yuav Tsum Muaj Kev Kawm Qib Siab, thiab txhua daim hlau uas tau ua tiav rau cov qhab nia. ASTM A203 / A203M Txheem Main Steel Qib: A203Gre E (A203Gre), Astm A203 Qib D (A203GRB).
| ASTM A203 Qib A | ASTM A203 Qib B | ASTM A203 Qib D | ASTM A203 Qib E |
| ASTM A203 Qib F |
ASTM A204 / A204M
ASTM A204 / A204M Kev Qhia Tshwj Xeeb Npog Molybdenum Alloy Hlau Daim Hlau, npaj tshwj xeeb rau Welded Boilers thiab lwm cov hlab ntsha thiab lwm cov hlab ntsha siab. Cov phiaj nyob rau hauv Astm A204 / A204M cov lus qhia tshwj xeeb muaj nyob rau hauv peb qib muaj cov qib sib txawv: Qib A; Qib B; thiab qib C. Cov hlau yuav raug tua. Cov hlau yuav tsum ua raws li cov tshuaj yuav tsum tau teev tseg. Kev kuaj nro rau cov phiaj yuav tsum ua raws li cov tseev kom muaj raws li.Qhov kev cai ntawm AN204 / ASTM A, B, C (A204GRA, B, C)
| ASTM A204 Qib A | ASTM A204 qib b | ASTM A204 Qib C |
ASTM A285 / A285M
ASTM A285/A285M specification covers carbon steel plates of low- and intermediate-tensile strengths which may be made by killed, semi-killed, capped, or rimmed steel. Cov phiaj no yog npaj rau Fusion - welded siab cov hlab ntsha. Daim phiaj feem ntau yog muab tso rau hauv qhov li-} Dov mob. Cov hlau yuav tsum ua raws li cov tshuaj uas yuav tsum tau ua. Cov phiaj, raws li sawv cev ntawm cov hnoos qeev, yuav ua raws li cov khoom ntiag tug hlau: astm A285 qib A, B, C (A285GRA, B, C).
| ASTM A285 Qib A | ASTM A285 Qib B | ASTM A285 Qib C |
ASTM A299 / A299M
ASTM A299 / A299M Cov Ntawv Qhia Tshwj Xeeb npog manganese- Cov paib hlau rau siv welded boilers thiab lwm cov hlab roj siab. Cov phiaj nyob rau hauv Astm A299 / A299M specification yog tsim tawm hauv ob qib. Cov hlau yuav tsum raug tua thiab yuav tsum ua raws li cov lis zoo ustenitic grain loj yuav tsum muaj. Kev ntsuas nro yuav tsum tau ua raws li cov cai tau hais txog.Qhov tus qauv A299 / A299 / A299 / A2996 / A299 / A299 / A2996 / A2996 / A2996 / A2996 / A299 / A299M ARTYRY).
| ASTM A299 Qib A | ASTM A299 Qib B |
ASTM A302 / A302M
ASTM A302 / A302M Kev Tshawb Fawb Tshwj Xeeb npog tau manganbenum {}}}}}}}}}}}}}}}}}}}}}} Cov paib hlau thiab lwm cov hlab ntsha jurded. Raws li lawv cov phiaj xwm ua tiav, cov phiaj xwm muaj nyob rau hauv plaub qib: Qib A, C, thiab D. Qhov muaj peev xwm ntawm cov tshuaj lom neeg muaj feem xyuam. Cov hlau yuav tsum raug tua thiab yuav tsum ua raws li cov khoom loj loj loj uas yuav tsum muaj. Cov phiaj yuav tsum muaj kev sim siab los txiav txim siab los txiav txim siab lub zog, it302m A302 / A302m AwCent lub zog:
| ASTM A302 Qib A | ASTM A302 Qib B | ASTM A302 Qib C | ASTM A302 Qib D |
ASTM A387 / A387M
ASTM A387 / A387M Kev Qhia Tshwj Xeeb Them Nyiaj Chromium {2 2}} molybdenum ingloys tsim rau kev pabcuam kub thiab txias. Cov khoom siv tau txiav txim siab raws li ASTM A387 / A387M cov lus qhia muaj nyob qib 2, 12, 11, 22, 21, 21 xyoos yuav tsum raug tua thiab. Cov ntaub ntawv hlau yuav tsum raug tua. Cov txheej txheem hlau hlau yuav tsum txheeb xyuas cov tshuaj tua hluav taws thiab cov khoom siv rau cov pa roj carbon, roj ntsha, Coladium, Boron, boron, titanium, thiab zirconium. Cov txheej txheem hlau hlau kuj tseem yuav ua rau cov kev xeem nruj thiab yuav tsum ua raws li cov muaj zog uas yuav tsum muaj ntawm lub zog tensile, kom lub zog muaj zog, thiab elongation.
| ASTM A387 Qib 5 Chav Kawm 5 Chav Kawm | ASTM A387 Qib 5 5 Chav Kawm | ASTM A387 Qib 11 Cov Tub Kawm Ntawv | ASTM A387 qib 11 chav kawm2 |
| ASTM A387 Qib 12 Chav Kawm | ASTM A387 Qib 12 Chav Kawm2 | ASTM A387 Qib 22 Chav Kawm | ASTM A387 Qib 22 Chav Kawm Qib Siab2 |
ASTM A515 / A515M
ASTM A515/A515M specification covers carbon-silicon steel plates primarily for intermediate- and higher-temperature service in welded boilers and other pressure vessels. Cov phiaj xwm muaj nyob rau hauv peb qib muaj qib sib txawv: Qib 60; Qeb 65; Thiab qib 70. Cov hlau yuav raug tua thiab ua rau ib coarse urustenitic grain loj xyaum ua. Cov hlau yuav tsum ua raws li cov tshuaj uas yuav tsum muaj astm A515 / A515m teev. Kev ntsuas nro yuav tsum tau ua raws li cov cai tau hais txog.Qhov lus A515 / A515M Txuj Ci Hlau: ASTM A515 Qib 6015,70 (A515GR60,65,70).
| ASTM A515 Qib 60 | ASTM A515 Qib 65 | ASTM A515 Qib 70 |
ASTM A516 / A516M
ASTM A516 / A516M Kev Qhia Tshwj Xeeb Npog Cov Khoom Siv Hluav Taws Xob siv rau hauv Welded Siab Hlawv Qhov Twg Yog Qhov Tseem Ceeb Tshaj Plaws yog qhov tseem ceeb. Raws li cov qib sib txawv, cov phiaj xwm muaj nyob rau hauv plaub qib: Qib 5 5, 60, 65, thiab 70. Cov hlau yuav tsum raug tua thiab yuav tsum ua raws li cov qoob loo zoo me me uas yuav tsum muaj. Cov khoom siv neeg kho tshuab xws li lub zog tensile, tawm suab lub zog yuav tsum txiav txim siab los ntawm kev sim siab nrees rau cov phiaj.
| ASTM A516 Qib 55 | ASTM A516 Qib 60 | ASTM A516 Qib 65 | ASTM A516 Qib 70 |
ASTM A517 / A517M
ASTM A517 / A517M Kev txiav txim siab tshwj xeeb npog cov qauv kev xav tau rau kev siv lub zog loj thiab tempering Alloy npaj rau kev siv hauv kev siv lub nkoj roj av thiab kub. Cov hlau yuav tsum raug tua thiab yuav tsum ua raws li cov lis zoo ustenitic grain loj yuav tsum muaj. Cov tshuaj ntsuam cua sov thiab cov khoom lag luam yuav tsum tau ua cov khoom siv yuav ua rau muaj cov pa roj carbon, boron, vanadium, zirconium, tooj liab, thiab columbium. Lub zog tensile ntawm cov phaj steel yuav tsum ua tau raws li qhov tseem ceeb rau lub zog rau tensile lub zog, tawm lub zog, thiab elongation lub zog. Cov khoom siv yuav tsum tau cov khoom siv tshuab xws li kev ntsuas nruj thiab hloov chaw A517 / A517M AN517 / A, F, E, F, P, J).
| ASTM A517 Qib A | ASTM A517 Qib B | ASTM A517 Qib E | ASTM A517 Qib F |
| ASTM A517 Qib P | ASTM A517 Qib J |
ASTM A533 / A533m
ASTM A533 / A533m Kev Qhia Tshwj Xeeb npog manganbenum- molybdenum {}}}}}}}}}}}}}}}} Cov paib hlau hlau rau kev siv Welded Siab Hlab Hlais. Cov khoom siv hlau yuav tsum tua thiab yuav tsum ua raws li cov nqi uas yuav tsum tau muaj nqis ntawm cov qoob loo uas xav tau thiab tseem yuav yog cua sov kho. Cov txheej txheem hlau hlau yuav tsum txheeb xyuas cov tshuaj tua hluav taws thiab cov tshuaj tua kab mob rau cov pa roj carbon, mangholor, silicon, molybdenum, thiab npib tsib xee. Kev kuaj nro yuav tsum ua nyob rau hauv cov hlau nplaum hlau yuav ua raws li qhov muaj zog ntawm lub zog, lees lub zog ntawm lub zog ntawm lub zog ntawm lub zog
| ASTM A533 Qeb Ib Hom Kawm1 | ASTM A533 Qib B Hom1 | ASTM A533 Qib C Class1 | ASTM A533 Qib D Class1 |
| ASTM A533 Qeb Ib Qib2 | ASTM A533 Qib B Chav Kawm2 | ASTM A533 Qib C Class2 | ASTM A533 Qib D Class2 |
| ASTM A533 Qeb Ib Chav Kawm Ntawv Hauv | ASTM A533 Qib B Chav Kawm Ntawv Hauv | ASTM A533 Qib C Class3 | ASTM A533 Qib D Class3 |
ASTM A537 / A537M
ASTM A537A537M Txuj Ci rau Kev Siab Ntsaws Hlau, Thaum Tshav Kub Kub Hlau:}}} {} {40), Chav Kawm 2 (A537Cl2), Chav Kawm 1 (A537CL1)
| ASTM A537 CLASS1 | ASTM A537 CLASS2 | ASTM A537 Mass3 |
ASTM A612 / A612M
ASTM A612 / A612M Kev Qhia Tshwj Xeeb Npog tua cov pa roj carbon {2 2}}} Cov hlau ntxaij ua haujlwm nyob rau hauv kev pabcuam thiab qis dua qhov kub thiab txias. Raws li kev ua hlau ua, cov hlau yuav tsum raug tua thiab yuav tsum ua raws li cov kev ua kom zoo ntawm kev ua kom zoo. Daim phiaj feem ntau yog muab rau hauv qhov li -} Dov. Daim phiaj yuav txiav txim ib txwm los yog kev ntxhov siab relieved, lossis ob qho tib si. Cov hlau yuav tsum ua raws li cov tshuaj uas yuav tsum tau ua. Cov phiaj, raws li sawv cev los ntawm kev nro ntsuas cov hnoos qeev, yuav ua raws li cov khoom ntiag tug.
| ASTM A612 |
ASTM A662 / A662M
ASTM A662 / A662M Cov lus qhia tshwj xeeb yog cov qib, qib kawm rau cov neeg siv hluav taws xob feem ntau yog qhov kub thiab txias}} Qhov ntau tshaj ntawm cov phiaj tsuas tsuas yog tsuas yog muaj peev xwm ntawm cov khoom sib xyaw kom tau raws li cov khoom ntiag tug ntawm cov khoom ntiag tug. Cov hlau yuav raug tua thiab cov phiaj yuav tsum tau kev kho cua sov. Lub zog tensile xws li tensile zog, tawm los ntawm cov phiaj hlau mus rau ib qho kev sib tw ntawm cov phiaj hlau .astm A662 Qib A, B, C (A662GR A, B, C).
| ASTM A662 Qib A | ASTM A662 Qib B | ASTM A662 Qib C |
En10028-2
En10028 {- 2 Txuj Ci Zoo Tshaj Plaws ntawm Alloy Steel Qauv Qauv: En15Gh, P255GH, P355GH, 16mO3.
| EN10028-2 P235GHGH | EN10028-2 P265GHGH | EN10028-2 P295GHGHGH | EN10028-2 P355GHGH |
| En 10028-2 16 mo3 |
Hoob rau En10028-3
EN10028-3 Txheem Qhia meej cov qauv xa tuaj thiab cov kev qhia tshwj xeeb rau kev ua kom zoo nkauj hlau: P275NY, P355NL1, P355NL2, P355NL2, P460NH thiab lwm yam.
| EN10028-3 P275N | EN10028-3 P275NH | EN10028-3 P275NL1 | EN10028-3 P275NL2 |
| EN10028-3 P355N | EN10028-3 P355NH | EN10028-3 P355NL1 | EN10028-3 P355NL2 |
| EN10028-3 P460N | EN10028-3 P460NH | EN10028-3 P460NL1 | EN10028-3 P460NL2 |
EN10028-5
EN10028-5 Cov qauv qhia cov qauv xa tuaj thiab cov lus qhia tshwj xeeb rau cov khoom siv siab ntawm Weldable Steel: P355ML2, P420M, P420ML1, P460M thiab lwm yam.
| EN10028-5 P355M | EN10028-5 P355ML1 | EN10028-5 P355ML2 | EN10028-5 P420m |
| EN10028-5 P420ML1 | EN10028-5 P420ML2 | EN10028-5 P460M | EN10028-5 P460ML1 |
| EN10028-5 P460ML2 |
EN10028-6
EN10028 {- 6 tus qauv muab cov qauv steel kub thiab cov khoom siv kub, P355QL2, P355QL2, P460QL2, P500Q thiab lwm yam.
| EN10028-6 P355Q | EN10028-6 P460Q | EN10028-6 P500Q | EN10028-6 P690q |
| EN10028-6 P355QH | EN10028-6 P460QH | EN10028-6 P500Qh | EN10028-6 P690qh |
| EN10028-6 P355QL1 | EN10028-6 P460Ql1 | EN10028-6 P500QL1 | EN10028-6 P690ql1 |
| EN10028-6 P355QL2 | EN10028-6 P460QL2 | EN10028-6 P500QL2 | EN10028-6 P690QL2 |
JIS G3115
JIS G3115 tus qauv qhia txog kev xa cov nkoj siab thiab cov khoom siv siab tsis zoo) nrog cov khoom siv hluav taws kub tshwj xeeb) nrog cov ntsuas kub thiab txias thiab txias.
| JIS G3115 SPV235 | JIS G3115 SPV315 | JIS G3115 SPV355 | JIS G3115 SPV410 |
| JIS G3115 SPV450 | JIS G3115 SPV490 |
JIS G3103
JIS G3103 tus qauv muab cov boiler thiab siab lub siab nrog carbon hlau thiab molybdenum allloy steel hlau: SB450, SB4500, sb480m.
| JIS G3103 SB410 | JIS G3103 SB450 | JIS G3103 SB480 | JIS G3103 SB450M |
| JIS G3103 SB480M |
GB713
GB713 tus qauv qhia cov ntsiab lus txiav txim, qib kawm thiab kev txwv, kev ntsuas, kev tshuaj xyuas, kos cim thiab cov lus qhia zoo. Cov qauv no siv rau lub boiler thiab ntsuas kub ntawm lub siab tawv hlau qib nrog rau lub siab tawv ntawm 3 ~ 250 hli
| GB713 Q245R | GB713 Q345R | GB713 Q370R | GB 713 12 cr1movr |
| GB 713 12 cr2mo1r | Gb 713 13 mnnimor | GB 713 14 cr1mor | GB 713 15} crmor |
| GB 713 18 mnmonbr |
GB3531
GB3531 tus qauv qhia cov ntsiab lus kev txiav txim, qib, txoj cai siv tau, kev kuaj xyuas cov phiaj xwm thiab cov qauv tshuaj tiv thaiv, kev kuaj xyuas cov phiaj xwm thiab cov qauv kev ntsuas, 15mnnidr, 09mnnidr.
| GB 3531 09 mnnidr | GB 3531 15 mnnidr | GB 3531 16 mndr |
DIN 17155
Din 17155 tus qauv yog cov lus qhia ua ntej German tshwj xeeb rau cov hlab ntsha siab hlau thiab boiler zoo phaj. Qhov kev ntsuas no (nrog rau tus qauv BS) tau tam sim no tau tshaj tawm los ntawm EN 100,Din 176N4,19mn6,15mo3,13 thiab lwm yam.
| DIN 17155 Nyob zoo | DIN 17155 Hii | Din 17155 10} crmo910 | 17155 13} crmo44 |
| Din 17155 15 mo3 | Din {{0} mn4 | Din 17155 19 mn6 |
Yog tias koj xav paub ntau ntxiv txog GNEE cov khoom, koj tuaj yeem xa email raualloy@gneesteelgroup.comCov. Peb zoo siab tshaj plaws los pab koj.
Muaj Peev Xwm Muaj:
| Tuab (mm) | Ntev x dav (hli) | Ntev x dav (hli) | Ntev x dav (hli) | Ntev x dav (hli) |
|---|---|---|---|---|
| 6 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 8 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 10 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 13 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 16 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 20 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 25 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 30 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 35 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 40 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 45 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 50 | 12000 x 2000 | 10000 x 2500 | 12000 x 3000 | 14000 x 3500 |
| 55 | 12000 x 2000 | 10000 x 2500 | 7500 x 3000 | 14000 x 3500 |
| 60 | 12000 x 2000 | 10000 x 2500 | 7500 x 3000 | |
| 65 | 12000 x 2000 | 10000 x 2500 | 7500 x 3000 | |
| 70 | 12000 x 2000 | 10000 x 2500 | 7500 x 3000 | |
| 75 | 12000 x 2000 | 10000 x 2500 | 7500 x 3000 | |
| 80 | 12000 x 2000 | 10000 x 2500 | 7500 x 3000 | |
| 85 | 8000 x 2000 | 7500 x 2500 | 7500 x 3000 | |
| 90 | 8000 x 2000 | 7500 x 2500 | 7500 x 3000 | |
| 95 | 8000 x 2000 | 7500 x 2500 | 7500 x 3000 | |
| 100 | 8000 x 2000 | 7500 x 2500 | 6000 x 3000 | |
| 110 | 7500 x 2000 | 7500 x 2500 | 6000 x 3000 | |
| 120 | 7500 x 2000 | 7500 x 2500 | 6000 x 3000 | |
| 130 | 7500 x 2000 | 7500 x 2500 | 6000 x 3000 | |
| 140 | 7500 x 2000 | 7500 x 2500 | 6000 x 3000 | |
| 150 | 7500 x 2000 | 7500 x 2500 | 6000 x 3000 | |
| 160 | 6000 x 2000 | 6000 x 2500 | 5000 x 3000 | |
| 170 | 6000 x 2000 | 6000 x 2500 | 5000 x 3000 | |
| 180 | 6000 x 2000 | 6000 x 2500 | 5000 x 3000 | |
| 190 | 6000 x 2000 | 6000 x 2500 | 5000 x 3000 | |
| 200 | 6000 x 2000 | 6000 x 2500 | 5000 x 3000 |
Dab tsi yog cov tseem ceeb nta ntawm boiler & siab rau cov hlau?
Siab Ntsej Muag Thiab Boiler Phaj Hlau yog lub npe hu rau cov yam ntxwv tseem ceeb uas ua rau lawv zoo rau peb cov ntawv thov. Cov yam ntxwv kub no suav nrog qhov kub thiab qhov kub thiab lub zog tsis kam, zoo heev weldability thiab formabion tsis kam thiab durability.
Kub & Siab Kuj
Boiler thiab siab rau lub nkoj hlau yog engineered kom kwv yees kev ua haujlwm dhau los. Hom hlau no muaj cov kev siv tshuab zog zoo heev thiab thermal stability, kom tswj tau cov qauv txheej txheem kev ntseeg siab thiab nce qhov kub. Cov nta no yog ib qho ntawm cov laj thawj vim li cas cov khoom no cov khoom tseem ceeb rau chav boilers, reactors, thiab chaw cia khoom lag luam.
Zoo heev Weldability & Formability
Kev yoog tau heev, W American Standard Steel dav Flange cov kev tsim kho, los ntawm cov tsev nyob rau loj- teev cov chaw muaj. Cov nqaj 'peev xwm los txhawb nqa kab rov tav thiab ntsug loads ua rau lawv haum rau cov khoom siv choj, txhua, kab hlau, thiab cov tshuab kab hlau hnyav.
Cov hlau siv nyob rau hauv boilers thiab siab cov hlab yuav tsum yooj yim los ua thiab koom nrog, vim qhov no tso cai rau kev ua kom zoo thiab ua ke. Peb lub nkoj siab thiab boiler steel khoom nthuav tawm cov khoom lag luam zoo nkauj weldility thiab formability, ua rau lawv haum rau ntau cov ntawv thov ntawm cov ntawv thov. Qhov no kom ntseeg tau tias koj tuaj yeem tsim cov rwj, cov hlab ntsha siab, thiab lwm yam qauv nrog kev paub thiab cov kev paub uas lawv yuav muab cov kev pabcuam siab tshaj plaws.
Corrosion Kuj & Durability
Corrosion tsis kam nyob rau hauv cov khoom lag luam yog qhov tseem ceeb hauv kev lag luam uas raug rau cov dej noo, tshuaj lom neeg, thiab muaj cov ntsuas kub. Peb cov raj mis boiler thiab siab steel khoom yog tsim nrog oxidation thiab corrosion, ua kom muaj kev them nqi kho mob ntev thiab txo tus nqi kho mob ntev dhau sijhawm.
Dab tsi yog cov ntawv thov ntawm boiler & siab txog ntsha hlau?
Lub raj mis siab thiab Boiler phaj hlau yog dav siv rau ntau yam kev siv hauv ntau hom kev lag luam sib txawv. Ntawm cov ntawv thov feem ntau yog:
- Lub zog tiam:Chav boilers, kev pauv hluav taws xob, thiab tshuab cua.
- Petrochemical Kev Lag Luam:Cov nkoj siab, kev ua chav nyob, thiab tso tsheb hlau luam cia khoom.
- Lub nkoj nkoj:Marine Boilers thiab cov qauv txheej txheem.
- Khoom Noj Khoom Haus & Dej Haus:Kom tsis muaj me me tso tsheb hlau luam, cov hlab ntsha siab, thiab kev ua chav nyob.
- Raug & Kev Lag Luam Hnyav:Huab cua cov neeg tau txais, autoclaves, thiab muaj cov kev muaj reactors.
Boiler thiab siab rau lub nkoj hlau kom tau raws li koj xav tau
BOILER thiab siab rau cov hlau yog qhov tseem ceeb tshaj plaws rau kev lag luam uas xav tau siab {{1 {2 {2} {} {tsis tshua muaj kev daws teeb meem. Nrhiav kev pom sab saum toj- zoo steel uas ua rau cov qauv kev lag luam kom ntseeg tau, ruaj, thiab kev nyab xeeb ntawm gnee.
Yog tias koj xav tau tso ib qho kev cai txiav txim, tau ntsib nrog peb pab kws tshaj lij thiab qhia peb paub koj cov khoom siv rhaub dej ua ke. Peb npaj txhij muab cov kev daws teeb meem zoo tshaj plaws ua rau koj cov kev xav tau
