已知在半径为R的圆中,长为l的弧所对的圆心角为
,则下列关系式不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3d921fa160bfa9f74fe51dedfe3413.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-12-20 22:03:55
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【推荐1】如图,点
在半径为
的
上,劣弧
的长为
,则
的大小是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9fdc1f8ed0ae44b54a9a2a3aca2db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/0cceaae0-10fe-42a4-856f-24c63923a868.png?resizew=136)
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【推荐2】如图,用一个半径为
的定滑轮带动重物上升,滑轮上一点P旋转了108°,假设绳索(粗细不计)与滑轮之间没有滑动,则重物上升了( )
![](https://img.xkw.com/dksih/QBM/2021/1/18/2638702794604544/2639389767368704/STEM/a738a92b-087c-40d1-ab15-57a012677a42.png?resizew=104)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://img.xkw.com/dksih/QBM/2021/1/18/2638702794604544/2639389767368704/STEM/a738a92b-087c-40d1-ab15-57a012677a42.png?resizew=104)
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