发布时间:2025-01-20 12:12:17
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.
我在自家院里新建了一个鱼池长2米宽15卵石铺底有假山供氧机有石块围边四周还种植了水草
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