單項選擇題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
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1.單項選擇題The operation of （） two alternators requires the voltages to be equal and also in phase.
A.paralleling
B.series-mounting
C.running
D.control
2.單項選擇題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
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