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如图所示,以下简单机械中属于费力杠杆的是A.瓶口起子B.镊子C.羊角锤D.动滑轮
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如图所示,以下简单机械中属于费力杠杆的是( )
A.
![](https://img.xintiku.com/upload/20/da/20daa717f718427e43cdbad73189003e.png)
瓶口起子
B.
![](https://img.xintiku.com/upload/e0/b3/e0b3ce835a74d441d280bba14fb015ea.png)
镊子
C.
![](https://img.xintiku.com/upload/7e/6d/7e6d974bdd60cf4d2dc7e0ece40e21cc.png)
羊角锤
D.
![](https://img.xintiku.com/upload/6d/a0/6da05bb140210dc408d1b96a4a578b3e.png)
动滑轮
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