—I'm not sure yet.
A:which is hers
B:which hers is
C:Whether is it hers
D:whether hers it is
如图所示,要将一圆柱体重物推上台阶,最小的作用力应是( )
已知等腰三角形的一边等于3,一边等于6,那么它的周长等于 ( )