单项选择题
To ensure oil purifier working in normal condition,the interval between two sludge discharging should not exceed（） hours.
- A.2
B.4
C.5
D.6
点击查看答案&解析
相关考题
-
单项选择题
Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid lineIf excess moisture is present in the system, the indicator will （）
A.activate the driers
B.change color
C.secure the compressor
D.add a predetermined amount of liquid drier -
单项选择题
In the navigation, cause the shafting over load most easily（）
A.stopping the main engine suddenly
B.changing the main engine running direction suddenly
C.the sailing from the shallow water area to the deep water area
D.the ship’s trim too much -
单项选择题
The oil index of main engine should be controlled to prevent it from in heavy weather（）
A.over heat
B.over speed
C.over pressure
D.over worn
