ÌâÄ¿ÄÚÈÝ

¡¾ÌâÄ¿¡¿Èçͼ£¬Ò»ÇáÉþͨ¹ýÎÞĦ²ÁµÄС¶¨»¬ÂÖOÓëСÇòBÁ¬½Ó£¬ÁíÒ»¶ËÓëÌ×Ôڹ⻬ÊúÖ±¸ËÉϵÄСÎï¿éAÁ¬½Ó£¬¸ËÁ½¶Ë¹Ì¶¨ÇÒ×ã¹»³¤£¬Îï¿éAÓɾ²Ö¹´ÓͼʾλÖÃÊͷźó£¬ÏÈÑظËÏòÉÏÔ˶¯£®Éèijʱ¿ÌÎï¿éAÔ˶¯µÄËٶȴóСΪvA£¬Ð¡ÇòBÔ˶¯µÄËٶȴóСΪvB£¬ÇáÉþÓë¸ËµÄ¼Ð½ÇΪ¦È.Ôò

A. vA£½vBcos¦È

B. vB£½vAcos¦È

C. AÎïÌåÉÏÉý¹ý³ÌÖÐÉþÖÐÕÅÁ¦²»±ä

D. AÉÏÉý¹ý³ÌÖУ¬ÉþÖÐÕÅÁ¦Ê¼ÖÕСÓÚBµÄÖØÁ¦

¡¾´ð°¸¡¿B

¡¾½âÎö¡¿½«Îï¿éAµÄËٶȷֽâΪÑØÉþ×Ó·½ÏòºÍ´¹Ö±ÓÚÉþ×ӵķ½Ïò£¬ÔÚÑØÉþ×Ó·½ÏòµÄ·ÖËٶȵÈÓÚBµÄËٶȣ®ÔÚÑØÉþ×Ó·½ÏòµÄ·ÖËÙ¶ÈΪvAcos¦È£¬ËùÒÔvB=vAcos¦È£®¹ÊA´íÎó£¬BÕýÈ·£®A¡¢B×é³ÉµÄϵͳÖØÁ¦×ö¹¦¿ªÊ¼µÄʱºòBµÄËÙ¶ÈÖð½¥Ôö´ó£¬µ«ÊÇÓÉÓÚvB=vAcos¦È£¬µ±¦È=90¡ãʱ£¬ÔòBµÄËÙ¶ÈΪ0£¬ËùÒÔBµÄËÙ¶ÈÒ»¶¨ÊÇÏÈÔö´óºó¼õС£®ÖªBÏÈÏòϼÓËÙºóÏòÏÂÏòϼõËÙ£¬¼ÓËٶȷ½ÏòÏÈÏòϺóÏòÉÏ£¬À­Á¦ÏÈСÓÚÖØÁ¦ºó´óÓÚÖØÁ¦£®¹ÊCD´íÎó£®¹ÊÑ¡B£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø