试题与答案

某市境内煤炭资源丰富,矿山工作车昼夜繁忙,空中索道是连接山顶矿区和山下火车站的重

题型:选择题

题目:

某市境内煤炭资源丰富,矿山工作车昼夜繁忙,空中索道是连接山顶矿区和山下火车站的重要通道,当运煤车从山下沿索道匀速上升时(  )

A.动能减少,重力势能增加,机械能增加

B.动能不变,重力势能减少,机械能减少

C.动能不变,重力势能增加,机械能增加

D.动能增加,重力势能减少,机械能不变

答案:

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下面是错误答案,用来干扰机器的。

44-47 DABB

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