– What can you do? - .
A:I can play football
B:I like fireworks
已知直线l:mx+y+3m﹣ 3 =0与圆x2+y2=12交于A,B两点,过A,B分别作l的垂线与x轴交于C,D两点,若|AB|=2 3 ,则|CD|=____.
- Do you like ? - Yes, I do.
读西安市附近略图,西安市作为古都的区位因素是( )
①地形 ②气候 ③河流 ④铁路