单项选择题
The operating medium for control systems may be （）.
A.compressed air
B.hydraulic oil
C.electricity
D.All of the above
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相关考题
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单项选择题
（） systems are provided with a stand-by device which will automatically be put in use in the even of the running device failing through a fault condition.
A.Alarm
B.Monitoring
C.Auto start-up
D.None of the above -
单项选择题
The difference between measured and desired values is called （）.
A.make-up
B.desired value
C.deviation
D.set value -
单项选择题
With UMS, when the engine room is unwatched （） will control the main engine.
A.the bridge officer on watch
B.the chief engineer
C.the duty engineer
D.the duty motorman
