He put his photos on it for everyone ____ (look) at.
下面是技术人员繁育植物时常用的几种方法,有关叙述不正确的是( )
____ you ____ a long bus ride to a lake in the countryside?
体重500 N的吴力同学用双手握住竖直的竹竿匀速上攀,他所受的摩擦力( )