发布时间:2025-02-01 11:16:09
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.
蝴蝶兰怎么养家庭养法简单蝴蝶兰家庭养法蝴蝶兰的养殖方法和注意事项
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