ÌâÄ¿ÄÚÈÝ
20£®ÈçͼËùʾ£¬¹â»¬¹ìµÀABCDÖÐBCΪԲ»¡£¬CD²¿·Öˮƽ£¬Ä©¶ËDµãÓëÓÒ¶Ë×ã¹»³¤µÄˮƽ´«¶¯´øÎÞ·ìÁ¬½Ó£®´«ËÍ´ø±íÃæ´Ö²Ú£¬ÒԺ㶨ËÙ¶ÈvÄæʱÕëת¶¯£®ÏÖ½«Ò»ÖÊÁ¿ÎªmµÄС»¬¿é´Ó¹ìµÀÉÏPµãÓɾ²Ö¹ÊÍ·Å£¬Ôò£¨¡¡¡¡£©A£® | Èç¹ûPµãλÖúÏÊÊ£¬Ð¡»¬¿é¿ÉÄÜ·µ»Øµ½Pµã | |
B£® | ÎÞÂÛPµãλÖÃÔں䦣¬Ð¡»¬¿é¶¼²»¿É·µ»Øµ½Pµã | |
C£® | »¬¿éÔÚ´«¶¯´øÏòÓÒÔ˶¯µÄ×î´ó¾àÀëÓëÊÍ·ÅʱPµãλÖÃÎÞ¹Ø | |
D£® | »¬¿éÔÚ´«¶¯´øÉÏÏòÓÒÔ˶¯µÄ×î´ó¾àÀëÓë´«¶¯´øËÙ¶ÈvÎÞ¹Ø |
·ÖÎö Èç¹ûPµãλÖúÏÊÊ£¬Ê¹Ð¡»¬¿éµ½´ïDµãʱËÙ¶ÈСÓÚµÈÓÚv£¬»¬¿éÔÚ´«ËÍ´øÉÏÊܵ½Ïò×óµÄĦ²ÁÁ¦×öÔȼõËÙÖ±ÏßÔ˶¯£¬ËٶȼõΪ0Ö®ºóÔÚĦ²ÁÁ¦µÄ×÷ÓÃÏÂÏò×ó×öÔȼÓËÙÔ˶¯£¬¸ù¾Ý¶¯Äܶ¨Àí¿É֪С»¬¿é¿ÉÒÔ·µ»ØPµã£¬µ±»¬¿éÇ¡ºÃËٶȵÈÓÚ0ʱ£¬ÏòÓÒÔ˶¯µÄ¾àÀë×î´ó£¬Óë´«ËÍ´øËÙ¶ÈËÙ¶ÈÎ޹أ®
½â´ð ½â£ºA¡¢Èç¹ûPµãλÖúÏÊÊ£¬Ê¹Ð¡»¬¿éµ½´ïDµãʱËÙ¶ÈСÓÚµÈÓÚv£¬Ôò»¬¿éÔÚ´«ËÍ´øÉÏÏÈ×öÔȼõËÙºó×öÔȼÓËÙ£¬·µ»ØDµãʱ£¬ËٶȴóС²»±ä£¬¸ù¾Ý¶¯Äܶ¨Àí¿É֪С»¬¿é¿ÉÒÔ·µ»ØPµã£¬¹ÊAÕýÈ·£¬B´íÎó£»
C¡¢»¬¿éÔÚ´«¶¯´øÏòÓÒ×öÔȼõËÙÔÚÏßÔ˶¯£¬ËٶȼõΪ0ʱ£¬Ô˶¯Î»ÒÆ×î´ó£¬Ô˶¯µÄ×î´ó¾àÀ룬Ôò×î´óλÒÆÓëµ½´ïDµãµÄËÙ¶ÈÓйأ¬¶øµ½´ïDµãËÙ¶ÈÓëÊÍ·ÅʱPµãλÖÃÓйأ¬Óë´«ËÍ´øËÙ¶ÈvÎ޹أ¬¹ÊC´íÎó£¬DÕýÈ·£»
¹ÊÑ¡£ºAD
µãÆÀ ±¾Ìâ×ۺϿ¼²éÁ˶¯Äܶ¨Àí¡¢ºÍÅ£¶ÙµÚ¶þ¶¨ÂɵÄÖ±½ÓÓ¦Ó㬽â¾ö±¾ÌâµÄ¹Ø¼üÀíÇåÎïÌåµÄÔ˶¯¹ý³Ì£¬ÖªµÀÎïÌåµÄÔ˶¯¹æÂÉ£¬½áºÏ¶¯Äܶ¨Àí¡¢Å£¶ÙµÚ¶þ¶¨ÂɺÍÔ˶¯Ñ§¹«Ê½½øÐÐÇó½â£®
A£® | ${\;}_{36}^{89}$KrÖÐÓÐ89¸öºË×Ó | |
B£® | YÔ×ÓºËÖк¬ÓÐ56¸öÖÐ×Ó | |
C£® | ÁѱäʱÊͷŵÄÄÜÁ¿Îª£¨m1-m2-m3-2m4£©c2 | |
D£® | ${\;}_{92}^{235}$UµÄ±È½áºÏÄÜ´óÓÚYÔ×Ӻ˵ıȽáºÏÄÜ |
A£® | bµãÓëdµãµÄÏßËٶȴóСÏàµÈ | |
B£® | aµãÓëcµãµÄÏßËٶȴóСÏàµÈ | |
C£® | cµãÓëbµãµÄ½ÇËٶȴóС²»ÏàµÈ | |
D£® | aµãÓëdµãµÄÏòÐļÓËٶȴóС֮±ÈΪ1£º8 |
A£® | ÎïÌåaËùÊܵľ²Ä¦²ÁÁ¦´óÓÚcËùÊܵľ²Ä¦²ÁÁ¦ | |
B£® | ÎïÌåbËùÊܵľ²Ä¦²ÁÁ¦×îС | |
C£® | ÎïÌåcµÄÏòÐļÓËÙ¶È×îС | |
D£® | תËÙ»ºÂýÔö´óʱ£¬ÎïÌåa×îÏÈ¿ªÊ¼»¬¶¯ |
A£® | 2.0rad/s | B£® | 3.14 rad/s | C£® | 6.0 rad/s | D£® | 7.9 rad/s |
A£® | $\sqrt{\frac{3{{v}_{1}}^{2}-{{v}_{2}}^{2}}{4}}$ | B£® | $\sqrt{\frac{{{v}_{1}}^{2}+{{v}_{2}}^{2}}{3}}$ | C£® | $\sqrt{\frac{4{{v}_{1}}^{2}-{{v}_{2}}^{2}}{3}}$ | D£® | $\sqrt{\frac{3{{v}_{2}}^{2}-{{v}_{1}}^{2}}{4}}$ |