发布时间:2025-02-01 11:13:54
电缆套官的型号与电缆截面相关,也与成品外径.
一般来说,电缆的截面不得大于电缆套管的内截面40%.
电缆的截面=成品外径的平方*0.7854.
电缆套官的内截面=内径的平方*0.7854.
房间是露天现浇做的原来的岩棉板保温没有去掉上面刷的腻子和做的墙布请问这样岩棉板对身体有影响不
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