题目内容

We try to speak English whenever and wherever we can; otherwise, we have littlechance to practice our English.

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Henry have arrived in Shanghai by now, for the plane took off (起飞) three hours ago.

1、管径为200毫米的铸铁管的表示为DN200

A. 对
B. 错

镀锌钢管可以采用焊接方式连接

A. 对
B. 错

法兰连接就是用螺栓将管道两个关口的法兰拉紧，使其紧密结合起来。

A. 对
B. 错