题目内容

万用表置欧姆挡时,()表笔连接表内电池负极。

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Depression, unexplained fear and unreasonable actions are the_______of a patient with mental health problems.

A.marks
B.systems
C.symbols
D.symptoms

如果一个二极管正、反向电阻值都很大,则二极管()状态。

如果一个二极管正、反向电阻值都很小,则二极管()状态。

I guess Professor Wang hasn’tfinished grading the papers yet. If he had, he would not keep us in_______ .

A.suspense
B.trouble
C.doubt
D.wonder

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