发布时间:2025-02-02 09:23:11
圆管理重=(外径-壁厚)*壁厚*0.02466
如果上面的48是外径那么就是:
(48-2.5)*2.5*0.02466=2.805075
通过携程在如家酒店定了三天房已经预付了房费但接下来两天不想住
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