单项选择题

After the trouble of the automatic control system has been completely eliminated, assistance is （） required.

A.remained
B.still
C.no longer
D.much mere

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单项选择题

（） is the actual value of the controlled condition.

A.Desired value
B.Set value
C.Measured value
D.Deviation

单项选择题

Which of the following marine examples belongs to the open loop control system?（）

A.Accommodation heating system
B.Steering gear
C.Boiler control
D.Cargo control