Q1: Dab tsi yog npauj npaim valve?A: Npauj npaim valve yog lub valve siv los kho cov dej ntws thiab siab, nws cov yam ntxwv tseem ceeb yog qhov me me, lub teeb yuag, qauv yooj yim, kev sib khi zoo.Hluav taws xob npauj npaim li qub yog dav siv hauv kev kho dej, petrochemical, metallurgy, hluav taws xob pow ...
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