题目

如图是“研究匀变速直线运动”实验中获得的一条纸带，O、A、B、C、D和E为纸带上六个计数点．加速度大小用a表示：                                                                                                                                                       （1）OD间的距离为                                                            �It was reposed by the foreign media that the 29th Beijing Olympic Games was　　 unique and successful event in　　 Olympic history． A a；不填　 B．the；the　 C．不填；the　 D．a；the