Vim li cas lub valve hluav taws xob ntaus ntawv tshwm sim dhau qhov tshwm sim? Txoj kev tiv thaiv yog dab tsi?
Vim li cas lub valve hluav taws xob ntaus ntawv tshwm sim dhau qhov tshwm sim? Txoj kev tiv thaiv yog dab tsi? Petrochemical, chaw nres tsheb fais fab, metallurgy thiab lwm yam lag luam xav tau kev ua haujlwm tas mus li, du, lub voj voog ntev. Yog li ntawd, yuav tsum tau siv lub valve yuav tsum muaj ...
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