某变电所220千伏配电装置的布置形式是将母线及母线隔离开关的安装位置抬高,构成母线与断路器,电流互感器等设备重叠布置。这种布置方式称为()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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