A、A.R1=1/4R2
B、B.R1=1/3R2
C、C.R2=1/3R1
更多“欲使图中的<img src="https://img.ppkao.com/2018-08/lina/2018083117570048398.jpg" />，则R<sub>1</sub>和R<sub>2</sub>的关系为（）。<br /> <img src="https://img.ppkao.com/2018-08/lina/2018083117570346724.jpg" /><p> 欲使图中的<img src="https://img.ppkao.com/2018-08/lina/2018083117570048398.jpg" />，则R<sub>1</sub>和R<sub>2</sub>的关系为（）。<br /> <img src="https://img.ppkao.com/2018-08/lina/2018083117570346724.jpg" /></p>”相关的问题
A、A.<img src="https://img.ppkao.com/2018-08/lina/201808191716043878.jpg" />
B.<img src="https://img.ppkao.com/2018-08/lina/201808191715542827.jpg" />
C.<img src="https://img.ppkao.com/2018-08/lina/2018081917160952254.jpg" />
D.<img src="https://img.ppkao.com/2018-08/lina/2018081917161444465.jpg" />
A、A.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017092509191375598.jpg" />
B.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017092509191686516.jpg" />
C.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017092509192040284.jpg" />
D.<img src="https://img.ppkao.com/2017-09/wangjinchen/2017092509192653582.jpg" />
A、A.<img src="https://img.ppkao.com/2018-07/wenxueying/2018071610102719826.png" />
B.<img src="https://img.ppkao.com/2018-07/wenxueying/2018071610163534802.png" />
C.<img src="https://img.ppkao.com/2018-07/wenxueying/2018071610115518750.png" />
D.<img src="https://img.ppkao.com/2018-07/wenxueying/2018071610121779280.png" />
A、A.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516571386102.jpg" /><img src="https://img.ppkao.com/2018-08/chenfang/2018081516572558372.jpg" />
B.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516572062708.jpg" />
C.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516572915872.jpg" />
D.<img src="https://img.ppkao.com/2018-08/chenfang/2018081516573482159.jpg" />
A、A.<img src="https://img.ppkao.com/2018-08/chenfang/2018082414251127110.jpg" />
B.<img src="https://img.ppkao.com/2018-08/chenfang/2018082414251618632.jpg" />
C.<img src="https://img.ppkao.com/2018-08/chenfang/2018082414252274438.jpg" />
D.<img src="https://img.ppkao.com/2018-08/chenfang/2018082414252792534.jpg" />
A、A.<img src="https://img.ppkao.com/2018-08/chenfang/2018081915393081347.jpg" />
B.<img src="https://img.ppkao.com/2018-08/chenfang/2018081915393697636.jpg" />
C.<img src="https://img.ppkao.com/2018-08/chenfang/2018081915394232099.jpg" />
D.<img src="https://img.ppkao.com/2018-08/chenfang/2018081915394668494.jpg" />
A、A.0
B.1
C.Q
D.<img src="https://img.ppkao.com/2018-09/wangjing/2018090616273927282.jpg" />
A、A.<img src="https://img.ppkao.com/2017-09/jiangyouai/2017090714354137749.jpg" />
B.<img src="https://img.ppkao.com/2017-09/jiangyouai/2017090714354974720.jpg" />
C.<img src="https://img.ppkao.com/2017-09/jiangyouai/2017090714355418132.jpg" />
D.<img src="https://img.ppkao.com/2017-09/jiangyouai/20170907143600941.jpg" />
A、A.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041517035379211.jpg" />
B.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041517035733869.jpg" />
C.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041517040187655.jpg" />
D.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041517040430083.jpg" />
A、图中沿着半径为R圆周运动的质点，所受的几个力中有一个是恒力<img src="https://img.ppkao.com/2019-04/wangjue/2019042617292572063.jpg" />，方向始终沿x轴正向，即<img src="https://img.ppkao.com/2019-04/wangjue/201904261730037303.jpg" />，当质点从A点沿逆时针方向走过3/4圆周到达B点时，力<img src="https://img.ppkao.com/2019-04/wangjue/2019042617292572063.jpg" />所作的功为W＝（）
<img src="https://img.ppkao.com/2019-04/wangjue/2019042617301494850.jpg" />
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