题目内容

检测整流器正极管的正向导通时,用万用表的（红／黑)表笔分别接P1、P2、P3、P4,用万用表的（红／黑)表笔接＋B。

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二极管具有什么特性？____。

三相发电机整流器至少需要____个二极管。

中英互译：Most important of all, apart from their hometown and parents, students couldn't catch sight of any familiar face and have to suffer from homelessness, which can cause certainserious mental disease.

中英互译：This issue is becoming a matter of concern for more and more people, especially forparents and experts in education.