Tube is welded pipe or cap in the threads in pipe fittings to cover the wall.

管帽是焊接在管端或装在管端外螺纹上以盖堵管子的管件。

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Tube is welded pipe or cap in the threads in pipe fittings to cover the wall.

管帽是焊接在管端或装在管端外螺纹上以盖堵管子的管件。

youdao