输入掩码字符“&”的含义是（） A.必须输入字母或数字 B.可以

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问题单项选择题

输入掩码字符“&”的含义是（）

A.必须输入字母或数字

B.可以选择输入字母或数字

C.必须输入一个任意的字符或一个空格

D.可以选择输入任意的字符或一个空格

答案

参考答案：C

阅读理解

阅读理解，判断正(T)误(F)。

Spring is coming. The spring sun is warm. Jenny likes spring. In spring she puts on her rain boots and

takes her umbrella. She likes to splash in the rain with her friends. Sometimes she rides her bike down the

street. She thinks spring is so fun.

( ) 1. The spring sun is warm.

( ) 2. Jenny likes to splash in the sun.

( ) 3. Jenny never rides her bike down the street.

( ) 4. Jenny puts on winter clothes in spring.

( ) 5. Jenny thinks spring is so fun.

单项选择题

手弧焊稳定燃烧时，电弧处于静特性曲线的（）段。

A.上升

B.下降

C.平特性