发布时间:2025-01-20 12:10:30
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.
早几天我买了一双匡威帆布鞋现在四侧都裂开了店员还说正常怎么办
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