发布时间:2025-01-20 11:54:54
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.
我家新房在二楼一楼是地下室通风设备噪音特别大在楼上关了窗户都听得见嗡嗡嗡嗡的声音我该怎么办
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