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5、切割厚度应按机械出厂铭牌规定进行，不得超厚切割。

2）家标准GB/(无衬垫仲裁试验)，其原理是，在定条件下，对已知尺寸的试样以恒定的加压速度施加负荷直至破碎，根据试样破碎时所承受的大压力和平均受压断面面积计算出试样的常温耐压强度。

我奉行的原则是先做朋友后做链接，这样成功几率也是很高的。

此外，圆环截面在承受内部或外部径向压力时，受力较均匀，因此，绝大多数钢管是圆管。

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(3)色泽鲜艳，无需表面装饰。

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