ͼʾΪijһƤ´ø´«¶¯×°Öá£Ö÷¶¯Âֵİ뾶Ϊr₁£¬´Ó¶¯Âֵİ뾶Ϊr₂¡£ÒÑÖªÖ÷¶¯ÂÖ×ö˳ʱÕëת¶¯£¬×ªËÙΪn£¬×ª¶¯¹ý³ÌÖÐƤ´ø²»´ò»¬¡£ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ¡¡¡¡¡¡¡¡¡££¨ÌîÈëÑ¡ÏîÇ°µÄ×Öĸ£¬ÓÐÌî´íµÄ²»µÃ·Ö£©

A£®´Ó¶¯ÂÖ×ö˳ʱÕëת¶¯	B£®´Ó¶¯ÂÖ×öÄæʱÕëת¶¯
C£®´Ó¶¯ÂÖµÄתËÙΪn	D£®´Ó¶¯ÂÖµÄתËÙΪn

BC

ÊÔÌâ·ÖÎö£ºÓÉÓÚƤ´ø½»²æ£¬Ö÷¶¯ÂÖ×ö˳ʱÕëת¶¯£¬Ôò´Ó¶¯ÂÖ×öÄæʱÕëת¶¯£¬¹ÊBÕýÈ·£»ÓÉÓÚת¶¯¹ý³ÌÖÐƤ´ø²»´ò»¬£¬¼´¶þÕß±ßÔµÏßËÙ¶ÈÏàͬv_Ö÷=v_´Ó£¬ÓÉv=¦Ør¼°¦Ø=2¦ÐnÖª£ºv=2¦Ðnr£¬´Ó¶¯ÂÖµÄתËÙΪn£¬¹ÊCÕýÈ·£®