ãã骨æä¸å
¬ç§°ç²çº§çä¸é称为æ大ç²å¾ãå½éª¨æç²å¾å¢å¤§æ¶ï¼å
¶
æ¯è¡¨é¢ç§¯åå°ï¼æ··ååçæ°´æ³¥ç¨éä¹åå°ï¼æ
å¨æ»¡è¶³ææ¯è¦æ±çåæä¸ï¼ç²éª¨æçæ大ç²å¾åºå°½éé大ä¸äºãå¨
é¢çæ··ååå·¥ç¨ä¸ï¼ç²éª¨æçç²å¾ä¸å¾å¤§äºæ··ååç»ææªé¢æå°å°ºå¯¸ç1/4ï¼å¹¶ä¸å¾å¤§äºé¢çæå°åè·ç3/4ã对äºæ··ååå®å¿æ¿ï¼å
¶æ大ç²å¾ä¸å®å¤§äºæ¿åç1/3ï¼å¹¶ä¸å¾è¶
è¿40mmã æ³µéæ··ååç¨çç¢ç³ï¼ä¸åºå¤§äºè¾é管å
å¾ç1/3ï¼åµç³ä¸åºå¤§äºè¾é管å
å¾ç1/2.5ã