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4分球阀直径多少
更新时间: 2020-10-03 00:00:00  

“4分球阀”中的“4分”是根据长度单位英寸演变得到的,一英寸等于八英分,四分球阀是为四英分,即将1英寸合25、4毫米划分为8等分,4分占其百分之四,即二分之一英寸,合12、7毫米。故“4分球阀”的直径即为12、7毫米。

关键词: 直径 多少

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