发布时间:2025-01-20 12:06:26
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.
你好农村自建房二楼上楼顶炮楼和连着炮楼有五六个平方的房子这个算三层还是二层层高都是三米
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