在“探究求合力的方法”实验中,如图所示,用AB两弹簧秤拉橡皮条

在“探究求合力的方法”实验中,如图所示,用AB两弹簧秤拉橡皮条结点O,使其位于E处,此时+=90°,然后保持A的读数不变,当角由图中所示的值逐渐减小时,要使结点仍在E处,可采取的办法是   ▲  

A.增大B的读数,减小

B.减小B的读数,减小

C.减小B的读数,增大

D.增大B的读数,增大

 

答案

B

解析:略

 

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