²úÆ·ÐÅÏ¢ÈçÏ£º<br> 1.³¤¶È£º2.6-2.9Ã×<br> 2.Ö±¾¶£º25-35ÀåÃ×£¬ 5% <br> Ö±¾¶£º35-60ÀåÃ×£¬ 90% <br> Ö±¾¶£º60ÀåÃ×ÒÔÉÏ£¬ 5% <br> 3ÖÊÁ¿£º ÎÞ½á°Ì£¬ ÎÞËÀ½á£¬ ¸ÉÖ±¡£