绘图4.绘出变电所主接线外桥式接线图。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
35kV变电所主接线一般有单母线分段,单母线、外桥、内桥、线路变压器组几种形式,下列哪种情况宜采用外桥接线?( )
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