如图斜面ABC，AB段是光滑的，BC段是有摩擦。某物体从A点由静止开始下滑，当滑至C点时恰好停止，则下列说法正确的是（）

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A：BC段的长度总大于AB段，但BC段的动摩擦因数越大时，BC段的长度越接近AB段的长度

B：BC段的长度总大于AB段，但BC段的动摩擦因数越小时，BC段的长度越接近AB段的长度

C：在θ角小到一定值时，只要BC段的动摩擦因数适当，AB段的长度可以大于BC段的长度

D：θ=30⁰时，选择适当的动摩擦因数，可使得AB的长度大于BC段的长度

上一题下一题 0.0难度选择题更新时间:2014-02-13 09:46:50

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C

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Nick is my good friend from England. Now let me tell you something(一些事情)about him.

Nick is a student and he is thirteen years old.His family are in Beijing now.His father,Mr Brown,is a manager in a hotel. His mother,Mrs Brown, is an English teachers at his school. Nick has a sister. Her name is Kate. Now they study in the same school.Look!This is a picture of their school. It is very big. There is a tall building with 23 classrooms in the middle of the school.The library is behind the tall building. The sports hall is next to the library. A playground is in front of the sports hall. It's big too. Nick and Kate like their school in Beijing very much.

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