單項(xiàng)選擇題

（） power is the power developed within the cylinder and can be measured by an engine indicator.

A.The shaft
B.The mechanical
C.The electric
D.The indicated

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單項(xiàng)選擇題

The operating medium for control systems may be （）.

A.compressed air
B.hydraulic oil
C.electricity
D.All of the above

單項(xiàng)選擇題

（） 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

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