在tan45°,sin60°,3.14,π ,0.101001中,无理数的个数是( )
A:2
B:3
C:4
D:5
Not having __________ her daughter abroad for a long time, the mother was very worried.
下列日用品中,一般情况下属于导体的是( )
如图是一个几何体的俯视图,则该几何体可能是( )