問題詳情
31. Which type of valve is installed to isolate machinery, equipment, and piping components forsystem operation, maintenance and overhaul, and damage control？
(A) Constant-flow valve
(B) Relief valve
(C) Safety valve
(D) Stop valve
參考答案
答案：D
難度：困難0.333333
統計：A(0),B(0),C(2),D(1),E(0)
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