問題詳情
12. To ensure the efficient operation of water-tube boilers, there is a compelling demand forclean, and free from gases in solution (e.g. air, oxygen). What equipment is it?
(A) Purifier
(B) Generator
(C) De-aerator
(D) Separator
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)