多余(needlessness), 此释义来源于网络辞典。
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This technique requires less treatment on the surface of the tube and needlessness of heat treatment to the tube, in addition, there is no need of large machines.
其工艺主要特点：降低了钢管表面处理要求、无需对钢管进行加热处理、无需大型机具。
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