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[单选] 如图1_8所示,在水平力F的作用下,物重为G的某物体沿墙壁匀速下滑,若物体与墙壁之间的动摩擦因数为μ,则物体所受摩擦力的大小为()
A.<img src="//wximg.233.com/attached/image/20130107/20130107170785038503.gif" alt="" border="0" /> B.<img src="//wximg.233.com/attached/image/20130107/20130107170787508750.gif" alt="" border="0" /> C.<img src="//wximg.233.com/attached/image/20130107/20130107170773527352.gif" alt="" border="0" /> D.<img src="//wximg.233.com/attached/image/20130107/20130107170710821082.gif" alt="" border="0" /><img src="//wximg.233.com/attached/image/20130107/20130107170841764176.gif" alt="" border="0" />
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