·µ»Ø

¶³ËÀ·çѩҹ£¬ÖØÉúÕæµÕŮŰ·­È«¼Ò

Ê×Ò³
¹ØµÆ
»¤ÑÛ
×ÖÌ壺
´ó
ÖÐ
С
µÚ180Õ Âä¶ùÕ¼¾¡ËàÍõ±ãÒË£¿£¨ÒÑÐÞ£©(1/2)
   ´æÊéÇ© Êé¼Ü¹ÜÀí ·µ»ØÄ¿Â¼
    µÚ180Õ  Âä¶ùÕ¼¾¡ËàÍõ±ãÒË£¿£¨ÒÑÐÞ£©

    ÀîÇäÂäÒ²Ö»ÊÇÓÌÔ¥ÁËÆ¬¿Ì£¬±ã¾ÍÈç´Ë×öÁË¡£
µÚ180Õ Âä¶ùÕ¼¾¡ËàÍõ±ãÒË£¿£¨ÒÑÐÞ£©(1/2),µã»÷ÏÂÒ»Ò³¼ÌÐøÔĶÁ
ÉÏÒ»Õ Ŀ¼ ÏÂÒ»Ò³