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问题 判断题

每个电话记录号码在一次循环中可以使用两次。

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阅读下列短文，选择正确答案。
      The U. S.'s flag is red, white and blue. It's the same colour as the U. K.'s and Australia's flag. It has fifty white stars, seven red stripes and six white stripes. People speak English in the U. S. The capital city of the U. S. is Washington, D. C.
1. People speak                  in the U. S.
[ ]
A. Chinese
B. English
C. French
2. How many white stars on the U. S.'s flag?
[ ]
A. Five.
B. Fifteen.
C. Fifty.

3. What colour are the stripes?

[ ]
A. White.
B. Red.
C. Red and white.
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单项选择题

室内采暖管道为焊接钢管时，施工安装中DN＞32mm时，连接方式为（）

A、螺纹连接

B、法兰连接

C、焊接

D、铆接
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