如图,以下四个关于“气体压强与流速的关系”的现象中,压强p1、p2大小关系正确的是(
A: p1>p2
B:p1>p2
C:p1>p2
D:p1>p2
若k<90<k+1(k是整数),则k=( )
She____(choose) as the chairman of the Students Union. It made us very happy.