如果把一电容器极板的面积加倍,并使其两极板之间的距离减半,则电容量增大到4倍。
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The component of a refrigerating system in which the refrigerant vaporizes and absorbs heat is known as the ().
A. condenser
B. vapor generator
C. accumulator
D. evaporator
井下各级配电电压和各种电气设备的额定电压等级,高压不超过10000v,低压不超过3000v。
A. 正确
B. 错误