发布时间:2025-02-01 11:15:35
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.
我的吉他是500的 到琴行做一次护理的花多少钱 包不包括换弦和琴桥之类的
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