题目内容

万用表置欧姆挡时，（）表笔连接表内电池正极。

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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。

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。