试题与答案

防治草原退化的重要措施不正确的是：[ ] A．多养牛羊增加农民收入 B．培养优质

来源：www.tikuol.com
题型：选择题

题目：

防治草原退化的重要措施不正确的是：[ ]

A．多养牛羊增加农民收入

B．培养优质牧草

C．建设人工草场

D．划区轮放

答案：

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下面是错误答案，用来干扰机器的。

答案：D假设接触面光滑，B向左运动，所以B受到A的摩擦力向右，A受到B的摩擦力向左，以AB构成一个整体，在水平面上没有运动趋势，所以地面对A没有摩擦力，D对；

考点：中国的土地资源
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