图中弹簧秤、绳和滑轮的重量均不计,绳与滑轮间的摩擦力不计,物

图中弹簧秤、绳和滑轮的重量均不计,绳与滑轮间的摩擦力不计,物体的重力都是G,在图甲、乙、丙三种情况下,弹簧秤的读数分别是F1F2F3,则(                                                                              

                                

    A F3F1=F2           BF3=F1F2    C F1=F2=F3       D F1F2=F3

                                                                                                                                  

答案

B

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