2．如图，质量均为m的物体A、B通过一劲度系数为K的弹簧相连，开始时B放在地面上，A、B均处于静止状态，现通过细绳将A向上拉起，当B刚要离开地面时，A上升距离为L，假设弹簧一直在弹性限度内，则

1．伽利略在著名的斜面实验中，让小球分别沿倾角不同、阻力很小的斜面从静止开始滚下，他通过实验观察和逻辑推理，得到的正确结论有

A．倾角一定时，小球在斜面上的位移与时间成正比

B．倾角一定时，小球在斜面上的速度与时间成正比

C．斜面长度一定时，小球从顶端滚到底端时的速度与倾角无关

D．斜面长度一定时，小球从顶端滚到底端所需的时间与倾角无关

37．（1）                                                                         

（2）                                                                        

（3）                                                                              

36．（1）                                                 （2）                    

（3）                                                                             

（4）                                                                           

35．（1）                                                                         

（2）                     

34．（1）         （2）                                                              

（3）                                                                                 

（4）                                                                                   

（5）                                                                                 

33．（1）                                                                           

（2）                                                                            

（3）                                                                             

（4）                                                                             

32．（1）           

（2）                                                                            

（3）                                                                           

（4）                                                                              

（5）                                                                            

31．（1）                                                                          

（2）

矿产资源

出口国

沿途主要经过的海域或海峡等

进口国

铁

矿

中

国

（3）              （4）                                                            

（5）