题目内容

PMW是（）。

A. 脉冲幅度调制
B. 脉冲宽度调制

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在本实验中，PMW信号占空比越大，台灯的亮度越（）。

A. 强
B. 弱
C. 不变

The most _________ danger for car drivers is disregard and disobedience of driving rules.

A. benign
B. malign
C. reckless
D. sober

Jack was being _________ and refusing to agree with anything we said.

A. persevere
B. perceive
C. perverse
D. preserve

According to the new law, all drivers and passengers must ___________when driving.

A. tally up
B. bang up
C. buckle up
D. take up