题目内容
如图所示,测力计、绳子和滑轮的质量都不计,摩擦不计。物体A重40N,物体B重10N。以下说法正确的是:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241222017862534.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241222017862534.jpg)
A.测力计示数10 N |
B.测力计示数20 N |
C.测力计示数30 N |
D.测力计示数40 N |
B
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.测力计示数10 N |
B.测力计示数20 N |
C.测力计示数30 N |
D.测力计示数40 N |