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    【题目】 “神州二号”无人飞船环绕地球108圈，顺利完成预定空间科学试验任务后，于2001愿军年1月16日在内蒙古中部准确返回，成功着陆，标志着我国载人航天工程第二次飞行实验取得圆满成功，若飞船穿越大气层时，有一段为匀速降落过程，则在此过程中飞船的（ ）

    A．动能减小，机械能增大 B．动能不变，机械能减小

    C．动能增大，机械能减小 D．动能减小，机械能不变

    【答案】B

    【解析】

    试题分析：动能大小的影响因素：物体的质量、物体的速度，质量越大，速度越大，动能越大；

    重力势能大小的影响因素：物体的质量、物体的高度，质量越大，所处的位置越高，重力势能越大；

    动能和势能统称为机械能．

    解：当飞船匀速降落时，飞船的质量不变、速度不变，动能不变；飞船的质量不变，高度越来越小，重力势能越来越小，机械能减小．

    故选B．

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