問題詳情
3. The layout of drain systems can often be improved by the use of automatic pumps.Condensate can be drained by gravity more readily to local receivers and then pumpedback to the engine room as required. What type of operated traps is above description?
(A) Mechanical trap
(B) Thermostatic trap
(C) Thermodynamic trap
(D) Vacuum trap
參考答案
答案：D
難度：適中0.415842
統計：A(34),B(47),C(37),D(84),E(0)