27.1. Dab tsi yog qhov ua haujlwm ntawm kev pub mis uncoiling?
27. Cov txheej txheem hauv kev tsim cov kauv kav hlau welded?
26. Koj cov yeeb nkab tau tsim hluav taws li cas txawv?
25. Cov khoom siv twg xav tau rau KAUV WELDED PIPES? Lub hauv paus ntsiab lus ntawm lub ntaus ntawv yog dab tsi?
24. Dab tsi raw cov ntaub ntawv xav tau rau KAUV WELDED PIPES?
23. Dab tsi yog cov kauv welded welded? Puas muaj lwm lub npe?
22. Cov teeb meem dab tsi uas yuav tshwm sim hauv kev tsim cov siab - zaus welded square kav? Yuav daws nws li cas?
21. Dab tsi yog qhov sib txawv ntawm qhov siab- zaus} zaus welded square yeeb nkab thiab hloov yeeb nkab?
20. Dab tsi yog siab - zaus welded square yeeb nkab? Puas muaj lwm lub npe?
19. Cov teeb meem twg yuav tshwm sim hauv kev tsim cov siab - zaus welded round round? Yuav daws nws li cas?
18. Cov kauj ruam twg yog cov kauj ruam tseem ceeb tshaj plaws hauv cov txheej txheem ntau lawm los ntawm high- zaus welded ncig cov hlab? Vim li cas?
3. Tshooj tshwj xeeb ntawm kev tsim cov khoom ntawm high- zaus welded puag ncig lub raj17. Dab tsi yog qhov siab- zaus} zaus vivi cov yeeb nkab? Puas muaj lwm lub npe?