阿摩線上測驗
39. For operating a marine boiler, which device does not belong to safety devices?
(A) Flame detector
(B) Soot blower
(C) Low-water level cut-off device
(D) Safety valves
答案：登入後查看
統計： A(117), B(579), C(138), D(158), E(0) #3003407
統計： A(117), B(579), C(138), D(158), E(0) #3003407
