如图所示人沿水平方�拉牛但没有拉动.下列说法中正确的是 A.绳拉牛的力和地面对牛的阻力大小相等b.绳拉牛的力和牛拉绳的力大小相等c.绳 Template




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tomski如图所示人沿水平方�拉牛但没有拉动.下列说法中正确的是 a.绳拉牛的力和地面对牛的阻力大小相等b.绳拉牛的力和牛拉绳的力大小相等c.绳 coloring