問題詳情
34.Which type of valve could permit a higher pressure source to supply a lower-pressure service, withan automatic response to changes in demand?
(A)Pressure-reducing valve
(B)Relief valve
(C)Check valve
(D)Safety valve
參考答案
答案：A
難度：適中0.586538
統計：A(61),B(19),C(17),D(5),E(0)