题目

--- 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.
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