問題詳情
19. What device could permit for a higher-pressure source to supply a lower-pressure service, with an automatic response to changes in demand?
(A) Constant flow fitting
(B) Relief valve
(C) Stop valve
(D) Pressure-reducing valve
參考答案
答案：D
難度：適中0.5
統計：A(3),B(13),C(11),D(29),E(0)