問題詳情
39. Foroperating a marine boiler, which device is used to permit viewing the stack without the necessity of leaving the operating station?
(A) Flame detector
(B) Smoke indicator
(C) Water level indicator
(D) Ignition operator
參考答案
答案：[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)