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2、4、5、6、8分管,管径分别是8、15、20、25mm。此外: 1、gb/t50106-2001 dn15,dn20,dn25是外径,是四分管和 … February 二月; 3、mar. March 三月; 4、apr. · 切换生存和创造模式的命令: 在我的世界中,切换生存和创造模式的命令如下: 1. Jan、feb、mar、apr、may、jun 是一些 缩写的月份名称,分别对应一年中的 1月、2月、3月、4月、5月和6月。 它们来自 … January 一月; 2、feb.