A:any
B:any other
C:other
D:another
— Oh, his father was angry with him and slapped him ____face.
— is the ticket of the museum for children?— Well, it's free for everyone.
如图所示,一个重为100N的小球被夹在竖直的墙壁和A点之间,已知球心O与A点的连线与竖直方向成θ角,且θ=60°,所有接触点和面均不计摩擦.试求小球对墙面的压力F1和对A点压力F2.
如图∠1与∠2是同位角,∠2与∠3是同位角,因此∠1与∠3是同位角,对吗?为什么?你是怎么来判断同位角的?