题目内容

Smoking can _____ lung cancer.

A. give
B. led to
C. lead to
D. affect

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I will cooperate _____ I am notified on time.

A. though
B. unless
C. in spite of
D. as long as

He focused his eyes _____ me.

A. with
B. at
C. to
D. on

晶体管丙类倍频器很少工作在

A. 过压状态
B. 临界状态
C. 过压或临界状态
D. 欠压状态

设计三倍频器时，最佳放大器的导通角为

A. 75度
B. 40度
C. 120度
D. 60度