A:2a
B:3a2
C:a3
D:a4
读图,图中五个省级行政单位中人口增长幅度最大的是( )
Before entering the room,I was asked to show the soldier the________ of my suitcase.
如图,四边形ABCD为矩形,AB=3,BC=1,以A为圆心,1为半径画圆,交线段AB于E,在圆弧DE上任取一点P,则直线AP与线段BC有公共点的概率为( )