题目内容

下列各选项中,()是有效的标识符。

A. b_____sum
B. 3sum
C. b-sum
D.
E. abc

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语言中最简单的数据类型包括( )

A. 整型、实型、逻辑型
B. 整型、实型、字符型
C. 整型、字符型、逻辑型
D. 整型、实型、逻辑型、字符型

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整型变量占内存单元数为()

A. 1
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C. 3
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AT89C51单片机有4个P口，分别是：

A. P0、P1、P2、P3
B. P1、P2、P3、P4
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The author stopped at a village on his way because he wanted to ____.

A. have his car repaired
B. enjoy the beautiful scenery
C. look for some bananas to fix his radiator
D. talk to some villagers to learn about their way of life

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下列各选项中,()是有效的标识符。

A. b_____sum B. 3sum C. b-sum D. E. abc

语言中最简单的数据类型包括( )

整型变量占内存单元数为()

AT89C51单片机有4个P口，分别是：

The author stopped at a village on his way because he wanted to ____.

A. b_____sum
B. 3sum
C. b-sum
D.
E. abc