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)
未解鎖
根據描述,這種閥門具有一個球狀的閥體,內...