发布时间:2025-01-20 11:54:15
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.
农村新房装修粉墙刷油漆多久能入住 新农村装修粉刷墙面何时才能入住
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