题目

         , science and technology are changing with each passing day and there have been AI which can understand people’s feelings.  A.All of a sudden       B.In that case      C.To my surprise 答案：C如图所示，两个完全相同的匀质光滑小球，静止在内壁光滑的半球形碗底，两球之间相互作用力的大小为P，每个小球对碗的压力大小均为F2若两小球质量不变，而半径均减小为原来、的一半，则 A.和均变大                       B.和均变小 C.变大，变小                   D.变小，变大