A:中部高,四周低
B:高原、平原、山地呈带状分布
C:地形复杂多样
D:以平原为主,地势地平
湿衣服经过晾晒就能变干的原因是( )
在直角坐标系中,一条直线经过A(﹣1,5),P(﹣2,a),B(3,﹣3)三点.
Don't do any other things while you are doing your homework. So please _________ your MP3.