æ好ä¸è¦ï¼
é¦å
é¶æé¯çæ©æ°ç¡¬åº¦æ¯2.7ï¼çççæ©æ°ç¡¬åº¦7-7.5ï¼ççç硬度è¿è¿å¤§äºé¶çã
å
¶æ¬¡ï¼ä½©æ´å¨ä¸èµ·ï¼åæ¹ä¼äº§çæ©æ¦ï¼æ©æ¦ä¹åé¶æé¯è¡¨é¢çè±çº¹å°ä¼ç£¨å¹³ï¼èå¨ççæé¯ä¸é¢ä¸æ ·ä¼åå¨é¶ç²ï¼è¿æ ·é¶æé¯ç£¨æï¼ççæé¯å
æ³½ä¸æ ·ä¼åæã
温馨提示：答案为网友推荐，仅供参考