发布时间:2025-01-20 12:12:06
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.
墙布弄脏了用什么能擦掉啊 捏虫子血冒上去的 然后拿水擦了擦也弄不掉周围还黑了点 怎么办急急急 很贵
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