如图在水平力F的作用下，重为G的物体沿竖直墙壁匀速下滑，物体与

如图在水平力F的作用下，重为G的物体沿竖直墙壁匀速下滑，物体与墙之间的动摩擦因数为μ，物体所受摩擦力大小为 ( )

A.μf B.μ（F＋Ｇ）

C.μ（F－Ｇ） D.Ｇ

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