A:Fx
B:mgxcosαsinα
C:mgxsinα
D:0
古诗填空。
—We can't be successful ___________ we keep working hard.
—I agree with you.
张华搜集了有关西藏和平解放、抗美援朝、土地改革的相关历史资料,要办一期手抄报,请你为他的手抄报拟一主题,下列最恰当的是( )