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單項(xiàng)選擇題

（） control system is one in which the control action is independent of the output.

A.Feed back
B.Negative feed back
C.Close loop
D.Open loop

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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

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

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