±¾À´½ÓÏÂÀ´Ò»¾íÊÇÔ¤¶¨Ð¡Ó¢Ð۵ģ¬Ö®ºóÔÙдÐÍÔ´óÇØ£¬µ«ÕæÕý¶¯±Ê£¬²Å·¢ÏÖСӢÐÛµÄÊÀ½ç×÷ΪÖ÷¸±±¾À´Ëµ£¬Äܹ»²åÈëµÄµØ·½Ì«ÉÙÁË£¬Í¬Ê±¶ÔÓÚÖ÷½ÇÈýÈË×éµÄ³É³¤Ò²¼«ÆäÓÐÏÞ£¬½ñÌìдÁËɾɾÁËд£¬Ê¼ÖÕ²»ÂúÒ⣬ÓÚÊÇ£¬ÎÒ¾ö¶¨Ëº¸ã¡£
СӢÐÛµÄÊÀ½ç£¬¾ÍÈÃÒøÊ±È¥¸ã°É¡£
È»ºóÖ÷½ÇÈýÈË×éµÄ¸±±¾ÊÀ½ç£¬ÎÒÒªÖØÐ¿¼ÂÇÒ»ÏÂÁË¡£
±§Ç¸£¬½ñÌì¿ÉÄÜÎÞ¸ü¡£
˺¸åÁË(1/2),µã»÷ÏÂÒ»Ò³¼ÌÐøÔĶÁ