单项选择题

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

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单项选择题（）is not a part of the main switchboard.

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船舶电气与船舶安全

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