用于表示正弦量的复数称为 ___ ,正弦交流电路中电感或电容元件与电源能量互换的规模通常用 ___ 功率来描述。
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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