题目内容

运放接入负反馈可以改善电路性能，接入正反馈可以产生自激振荡

A. 对
B. 错

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Section A21.the investigation, the committee published the report on the cause of the accident.

A)Completed
B)Completing
C)Having completed
D) To have completed

22.The report shows that over half of the women are suffering_________second-hand smoke at theworkplace.

A)in
B)for
C)on
D)from

23. Our goal is to fulfill the needs of our clients, __________challenging they may be.

A)however
B)whenever
C)wherever
D)whatever

24. Only after the secretary saw the train disappear in sight___________the railway station.

A) he leaves
B)has he left
C) he left
D)did he leave