To （） , the power is supplied by main switchboard directly not though sub-board.<br>A:save network cost<br>B:improve the reliability of supplying power to important load<br>C:prevent sequence reverse<br>D:increase the power factor of important load

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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