题目内容

C51数据类型中关键词“bit”用于定义（）。

A. 位变量
B. 字节变量
C. 无符号变量
D. 特殊功能寄存器变量

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Listen and respond: Listen to the 5 questions and choose the correct answers.1___________________________

A. Here it is.
B. I'm sorry to say so.
Coffee, please.
D. See you next time.

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A. Very good.
B. Not yet.
C. That's nice.
D. It's far away.

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A. Take your time.
B. Yes, here you are.
C. Never mind.
D. That's too large.

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A. That's important.
B. No problem.
C. Yes, very much.
D. No, thanks.