·µ»Ø
¾Þ¸»Å®Ðö
Ê×Ò³
¹ØµÆ
»¤ÑÛ
×ÖÌ壺
´ó
ÖÐ
С
ÇëÒ»¸ö¼Ù(1/2)
´æÊéÇ©
Êé¼Ü¹ÜÀí
·µ»ØÄ¿Â¼
½ñÌìÓеãæ£¬Ä¾ÓÐʱ¼ä¸üÐÂѽ¡£Çë¸öÔ¼١£
ÇëÒ»¸ö¼Ù(1/2),µã»÷ÏÂÒ»Ò³¼ÌÐøÔĶÁ
ÉÏÒ»ÕÂ
Ŀ¼
ÏÂÒ»Ò³