如圖,甲、乙兩木塊疊放在水平面上,甲的質(zhì)量大于乙的質(zhì)量,將水平恒力F作用在甲上,甲、乙能在一起做勻加速直線運(yùn)動(dòng),若將水平恒力F作用在乙上,甲、乙也能在一起做勻加速直線運(yùn)動(dòng).第一種情況與第二種情況相比(    )                                                                                                                     

                                                                                                             

     A. 兩種情況乙所受摩擦力皆相同

     B.  兩種情況甲所受地面摩擦力相同

     C. 后一種情況乙所受摩擦力較大

     D. 后一種情況甲所受摩擦力較大

                                                                                                                                   

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