單項(xiàng)選擇題

Synchrocope and synchro light are located on （） of main switchboard.

A.load panel
B.emergency generator control panel
C.battery changing and discharging panel
D.paralleling panel

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單項(xiàng)選擇題

To （） , the power is supplied by main switchboard directly not though sub-board.

A.save network cost
B.improve the reliability of supplying power to important load
C.prevent sequence reverse
D.increase the power factor of important load

單項(xiàng)選擇題

（）is not installed on the main switchboard.

A.Ammeter and changeover switch
B.Power factor meter
C.Synchroscope
D.Reverse sequence relay