题目内容

交流电的有效值总是大于瞬时值

A. 对
B. 错

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我国民用电压为220V,指的是瞬时值

A. 对
B. 错

_______(甜甜圈) is one of American favourite breakfast food.

I love this store which ofen sells _______(精美的) desserts.

My mom bought this ______(烤箱) to bake bread.

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