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To ensure proper seating when closing a valve on a tank，the valve should be ______．
A.Set up as tight as possible by hand
B.Set up tight using a valve wrench
C.Closed，opened a half turn，and then closed
D.Closed against the stop and the locking pin inserted
参考答案
更多 “ To ensure proper seating when closing a valve on a tank，the valve should be ______．A.Set up as tight as possible by handB.Set up tight using a valve wrenchC.Closed，opened a half turn，and then closedD.Closed against the stop and the locking pin inserted ” 相关考题
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spectacle valveC
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