“只要电源是正弦的,电路中各部分电流及电压都是正弦的”说法对吗?为什么?
说法不对!电源虽然是正弦的,但是如果电路中存在非线性元件,在非线性元件上就会出现非正弦响应。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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