一台22kV·A,400/100V的单相变压器,低压侧加100V,高压侧开路,测得I0=2A,P0=20W;当高压侧加400V,低压侧开路,测得I0=-_____A,P0=____W。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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