题目内容

How does earning large amounts of spending money change students’ feeling about school education?

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Why are teenagers working long hours more likely to have alcohol and drug problems?

What is the overall attitude of the author regarding doing part-time jobs while studying?

由发电机绕组首端引出的输电线称为___，由电源绕组尾端中性点引出的输电线称为_。_与之间的电压是线电压，与之间的电压是相电压。电源绕组作接时，其线电压是相电压的倍；电源绕组作接时，线电压是相电压的1倍。对称三相Y接电路中，中线电流通常为___。

一个完整电路中有n各元件,如果前n-1个元件都是吸收电能的,则第n个元件必然是()。

A. 释放电能
B. 吸收电能
C. 功率有可能等于零
D. 不能确定