¿Îʱ¸ú×Ù¼ì²â(ÈýÊ®¾Å)¡¡»úеÕñ¶¯

¶ÔµãѵÁ·£º¼òгÔ˶¯

1£®(2013·ÉϺ£¸ß¿¼)×ö¼òгÕñ¶¯µÄÎïÌ壬µ±Ëüÿ´Î¾­¹ýͬһλÖÃʱ£¬¿ÉÄܲ»Í¬µÄÎïÀíÁ¿ÊÇ

(¡¡¡¡)

A£®Î»ÒÆ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡               B£®ËÙ¶È

C£®¼ÓËٶȠ                                     D£®»Ø¸´Á¦

2.Èçͼ1Ëùʾ£¬µ¯»ÉÕñ×ÓÔÚÕñ¶¯¹ý³ÌÖУ¬Õñ×Ó´Óaµ½bÀúʱ0.2 s£¬Õñ×Ó¾­a¡¢bÁ½µãʱËÙ¶ÈÏàͬ£¬ÈôËü´ÓbÔٻص½aµÄ×î¶Ìʱ¼äΪ0.4 s£¬Ôò¸ÃÕñ×ÓµÄÕñ¶¯ÆµÂÊΪ(¡¡¡¡)

A£®1 Hz                                          B£®1.25 Hz

C£®2 Hz                                           D£®2.5 Hz