发布时间:2025-02-02 09:31:19
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
洗澡时将手机带进浴室听歌然后打电话时听到的声音怪怪的不清楚是什么原因
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