阿摩線上測驗
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
答案：登入後查看
統計： A(40), B(216), C(50), D(36), E(0) #1111788
統計： A(40), B(216), C(50), D(36), E(0) #1111788
