题型:填空题 一物体沿固定的斜面从静止开始向下运动,经过时间t0滑至斜面底端。已知在物体运动过程中物体所受的摩擦力恒定。若用F、v、s和E分别表示该物体所受的合力、物体的速度、位移和机械能,则下列图象中可能正确的是[ ]A.B.C.D. 查看答案
题型:填空题 According to the speaker, why did he fail to catch the point().A.Because he was away for a while.B.Because he simply couldn’t understand.C.Because he was thinking about something else.D.Because he fell asleep. 查看答案