在正弦交流电路中,_、_和_称为正弦量的三要素。_元件和_元件称为动态元件,感抗与_成正比,容抗与_成反比。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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