发布时间:2025-02-01 11:06:31
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.
想把家里房子墙面装修成水泥墙面,,请问装修步骤和应该准备的材料是什么样的
2025-02-01 11:06:31 2025-02-01 11:06:31我想快速学会看图纸有什么秘诀没有急切的需要这方面的知识做预算都需要掌握哪些知识怎么做预算啊
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