一副三角板按如图所示叠放在一起,则图中∠α的度数是( )
A:75°
B:60°
C:45°
D:105°
各项都是正数的等比数列an的公比q≠1,且a2,12a3,a1成等差数列,则a4+a5a3+a4的值为( )
There are not many cars on the road____ ____the bad weather.