发布时间:2025-02-01 11:16:50
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.
我刚买2个周的黄金戒指今天不小心被刮花了里面居然是黑色的有哪种情况下会变成黑色啊
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