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【简答题】
三相电源相线与中性线之间的电压称为 ,相线与相线之间的电压称为 。
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皮皮学刷刷变学霸
举一反三
【简答题】从物理上来讲 通信系统不使用传输介质的是()
【单选题】He grabbed its skinny trunk of a small tree with both hands, yanked it over sideways, and cracked it in half on his knee. Why do you think he did that?
A.
He did that to show his anger.
B.
He was an idle man.
C.
He was a drug dealer.
【简答题】三相异步电动机被广泛用来驱动各种 机床、 机、中小型 机、水泵及 机械等。