题目内容

4.[音频]

A. He is doing physical exercises.
B. He is learning how to shoot.
C. He is feeling cold and wants to buy clothes.
D. He is ill and having an injection.

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A. Going to see the dentist today.
B. Taking off the clothes.
C. Not going to see the dentist.
D. Going to watch a movie.

A. 输入继电器和输出继电器
B. 输出继电器和输入继电器
C. 状态继电器和中间继电器
D. 中间继电器和状态继电器

A. 普通状态
B. 回零状态
C. 初始状态
D. 以上都不是

ADD
B. SUB
C. INC
DEC