发布时间:2025-01-20 12:15:50
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.
适合入门的单反相机品牌有哪些2023学生党便宜又好用的相机推荐
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