题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
A.当分子力表现为引力时,分子力随分子间距离的增大而减小![]() | B.当分子力表现为引力时,分子势能随分子间距离减小而减小![]() | C.当分子力表现为引力时,分子势能随分子间距离减小而增大![]() | D.用打气筒给自行车打气时,越下压越费力,说明分子间斥力越来越大,分子间势能越来越大 |
B
分子间的距离为平衡距离时,作用力为零。分子间的距离小于平衡距离时,分子力为斥力;分子间的距离大于平衡距离时,分子力为引力。并且分子力做正功,分子势能减小,反之分子势能增大,B对AC错;给自行车打气是压强增大, D错。本题考查分子间的作用力,较易题。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113726304332.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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