PMW是()。
A. 脉冲幅度调制
B. 脉冲宽度调制
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