A:bringing back
B:bringing together
C:which brought around
D:gathering around
某物体自斜面顶端从静止开始匀加速下滑,经过( 2 +1)秒到达斜面中点,从斜面中点到达斜面底端的时间是( )
图中所示的甲、乙两地的气候类型分别是( )