問題詳情
12.Which equipment is usually required to remove air and noncondensable vapors that leak intothe sub-atmospheric parts of the steam power plant?
(A)Gland sealing
(B)Drains
(C)Air ejector
(D)Labyrinths
參考答案
答案：C
難度：適中0.428571
統計：A(2),B(4),C(6),D(1),E(0)