如图4所示,人沿水平方向拉牛。但没有拉动。其中说法正确的是  

如图4所示,人沿水平方向拉牛。但没有拉动。其中说法正确的是              (     )

   A、绳拉牛的力与牛拉绳的力是一对平衡力

   B、绳拉牛的力与地面对牛的摩擦力是一对平衡力

   C、绳拉牛的力小于牛拉绳的力    

   D、绳拉牛的力小于地面对牛的摩擦力 

答案

B

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