單項(xiàng)選擇題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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1.單項(xiàng)選擇題() is the actual value of the controlled condition.

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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題The operation of () two alternators requires the voltages to be equal and also in phase.

A.paralleling
B.series-mounting
C.running
D.control

4.單項(xiàng)選擇題With a purely () load the voltage and current are in phase, giving a power factor of one.

A.inductive
B.resistance
C.combined
D.capacitate