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【单选题】
二力平衡图片1.png 如图所示, 农民 抓住 绳子用力 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 大于 牛拉绳的力
B.
绳拉牛的力小于地面对牛的摩擦力
C.
绳拉牛的力与牛拉绳的一对平衡力
D.
绳拉牛的力与地面对牛的摩擦力是一对平衡力
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hoped
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the thick fog made it difficult for the policemen to crack down Davison.
B.
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可制成不同类型的片剂满足医疗、预防用药的不同需要
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查看完整题目与答案