发布时间:2025-02-01 11:19:24
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.
我要见一个地上式蓄水池,为C25混凝土,请问这样注水以后不会垮了吧
2025-02-01 11:19:24买了一支可以换墨水囊的钢笔可是不知道怎么用墨水囊是封住的怎么打开来啊
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