·µ»ØÔ¼ 0 ÏîÐÂÎÅËÑË÷½á¹û  
ä¯ÀÀ¹ØÓÚ ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ µÄÐÂÎÅ
 
Ê×Ò³ ÉÏÒ»Ò³ -2 [-1] [0] ÏÂÒ»Ò³ βҳ