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January 一月; 2、feb. April 四月; 5、may无缩写 五月; 6、jun. March 三月; 4、apr. 1寸=2. 53. 5cm ,2寸=3. 54. 9cm,4寸=7. 29. 9cm,6寸=10. 215. 2cm ,8寸=15. 220. 3cm ,10寸=23. 528. 5cm 。 扩展资料 1、尺寸换算法则为1英寸=2. 54厘 … (可复制)㉛ ㉜ ㉝ ㉞ ㉟ ㊱ ㊲ ㊳ ㊴ ㊵ … (可复制)⓪ ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ ⑮ ⑯ ⑰ ⑱ ⑲ ⑳ ㉑ ㉒ ㉓ ㉔ ㉕ ㉖ ㉗ ㉘ ㉙ ㉚ 扩展,31-50,10-80: February 二月; 3、mar. 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,是四分管和六分管的直径 。 2、dn是指管道的公称直径,注 …