Some of the stickers belong to me, while the rest are ____________.
A:him and her
B:his and her
C:his and hers
D:him and hers
一根轻质弹簧一端固定,用大小为F1的力压弹簧的另一端,平衡时长度为l1;改用大小为F2的力拉弹簧,平衡时长度为l2.弹簧的拉伸或压缩均在弹性限度内,该弹簧的劲度系数为( )