20. The valve has a bulbous body, housing a valve seat and screw down
plug or disc arrange at right angles to the axis of the pipe. What
kind of valves is above description?
(A) Gate valve
(B) Globe valve
(C) Butterfly valve
(D) Check valve
詳解 (共 1 筆)
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題目中有提到bulbous body，中...
私人筆記 (共 1 筆)
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該閥門有一個球狀體，裝有一個閥座，旋塞或...
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