Component parts with bore such as pin valve, internal thread, oil pipe take up a large proportion in the oil industry, chemical industry and modern manufacturing industry.

  • 孔类零件如针阀体、内螺纹、油管等在石油、化工和现代制造业中占有相当大的比重。

  • 互联网摘选 2025-01-20 18:54:03

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