我们常用弯头（弯管、法兰、三通、大小关）作为一种管件。

We usually use elbow( bend, flange, tee, reducer) as a kind of pipe fitting.

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我们常用弯头（弯管、法兰、三通、大小关）作为一种管件。

We usually use elbow( bend, flange, tee, reducer) as a kind of pipe fitting.

youdao