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发布时间:2017-06-29 22:27:25New York, September 15. During a heavy rainfall last night a bus carrying 42 passengers slipped off the road on Highway 28, killing 36 of the passengers and the driver. A spokesman for the Highway Patrol(巡逻队) who arrived at the scene shortly after 11:30 p.m. estimated(估计) that the accident had happened about half an hour before. The injured and the dead were sent to the nearest town of Valley View.At the point where the accident happened the road has a three-lane(三条行车线) highway with many curves(弯道). Cause of the accident has not been fully found out.1. It was very likely that the accident happened _______.A. after 11: 30 p.m. B. in the city of New YorkC. at or about 11: 00 p.m. D. in the town of Valley View2. How many people died in the accident?A. 37 B. 36 C. 43 D. 423. In consideration of what caused the accident, one should pay attention to _______.A. the careless driver B. the nearest town of Valley ViewC. Highway 28 D. the road with many curves1.C。推断题。巡逻队发言人晚上11点半到达,发言人说是大约半小时前发生车祸的,那车祸应该是大约11点钟发生的。2.A。细节题。36个乘客再加一名司机,当然是死了37人。3.D。推断题。因为最后一段第1句话At the point where the accident happened the road has a three-lane(三条行车线) highway with many curves(弯道),所以答案为D。

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发布时间:2017-08-20 13:49:031、汽车的底盘质量都较大,这样可以降低汽车的重心,增加汽车行驶时的稳度。2、汽车的车身设计成流线型,是为了减小汽车行驶时受到的阻力3、汽车前进的动力 地面对主动轮的摩擦力(主动轮与从动轮与地面的摩擦力的方向相反)4、汽车在平直路面匀速前进时 牵引力与阻力互相平衡,汽车所受重力与地面的支持力平衡5、汽车拐弯时:①司机要打方向盘 力是改变物体运动状态的原因;②乘客会向拐弯的反方向倾倒 由于乘客具有惯性6、汽车急刹车(减速)时,①司机踩刹车 力是改变物体运动状态的原因;②乘客会向车行方向倾倒――惯性 ;③司机用较小的力就能刹住车――杠杆原理;④用力踩刹车 增大压力来增大摩擦;⑤急刹车时,车轮与地面的摩擦由滚动变摩擦成滑动摩擦7、不同用途的汽车的车轮还存在大小和个数的差异 这与汽车对路面的压强大小相关8、汽车的座椅都设计得既宽且大,这样就减小了对坐车人的压强,使人乘坐舒服9、汽车快速行驶时,车的尾部会形成一个低气压区,这是我们常常能在运动的汽车尾部看到卷扬的尘土形成原因10、交通管理部门要求:①小汽车的司机和前排乘客必须系好安全带 这样可以防止惯性的危害;②严禁车辆超载 不仅仅减小车辆对路面的破坏,还有减小摩擦、惯性等;③严禁车辆超速 防止急刹车时,因反应距离和制动距离过长而造成车祸11、简单机械的应用:①方向盘、车轮、开窗摇柄等都是轮轴,②调速杆,自动开关门装置是杠杆12、汽车爬坡时要调为低速:由P=Fv,功率一定时,降低速度,可增大牵引力13、关于速度路程,时间的计算问题;参照物与运动状态的描述问题14、认识限速,里程,禁鸣等标志牌,了解其含义