题目内容

测得正向阻值时，与黑表笔相连的是二极管的（）极。

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His_______argument against our proposal is based on misinformation,

A.organic
B.valid
C.formal
D.principal

万用表置欧姆挡时，（）表笔连接表内电池正极。

After a short holiday, he_______ himself once more to his studies.

A.applied
B.engaged
C.managed
D.conducted

万用表置欧姆挡时，（）表笔连接表内电池负极。