发布时间:2025-01-20 11:59:01
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.
据称发达国家人工成本很高很多家庭自己动手装修房子在我国这样自己装修房子的可行性怎么样
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