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如图.已知l1⊥l2,圆心在l1上、半径为1m的圆O在t=0时与l2相切于点A,...
如图.已知l
1⊥l
2,圆心在l
1上、半径为1m的圆O在t=0时与l
2相切于点A,圆O沿l
1以1m/s的速度匀速向上移动,圆被直线l
2所截上方圆弧长记为x,令y=cosx,则y与时间t(0≤t≤1,单位:s)的函数y=f(t)的图象大致为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745708655/SYS201310251243157457086009_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745708655/SYS201310251243157457086009_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745708655/SYS201310251243157457086009_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745708655/SYS201310251243157457086009_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124315745708655/SYS201310251243157457086009_ST/images4.png)
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