--- How did the global financial crisis ? --- I’m not quite sure. Anyhow, it is an very important problem facing us. A.come up B.come about C.come along D.come around 答案:B物体做自由落体运动,Ek代表动能,Ep代表势能,h代表下落的距离,v代表速度,t代表时间,以地面为零势能面.如图所示图象中,能正确反映各物理量之间关系的是( )A.B.C.D.