点A在点B的上方,从A看B的俯角为α,从B看A的仰角为β,则( )
A:α=β
B:α+β=π2
C:α+β=π
D:α>β
谚语“风吹沙石跑,车轮比人高”反映的气候类型是( )
Here comes the bus. Let's .