问题
问答题 简答题
机车的蛇行运动是怎样形成的?
答案
参考答案:
由于车轮踏面具有一定的锥度以及轮缘与钢轨间存有间隙,当轮对中心在进行中偶尔偏离直线轨道的中心时,两轮便以不同直径的滚动圆在钢轨上滚动,使轮对在行进中一面作横向摆动,一面围绕其重心的垂轴来回摇头,这样就形成了一种被称为蛇行运动的波形运动。这种运动是铁路机车车辆的特有运动。
机车的蛇行运动是怎样形成的?
参考答案:
由于车轮踏面具有一定的锥度以及轮缘与钢轨间存有间隙,当轮对中心在进行中偶尔偏离直线轨道的中心时,两轮便以不同直径的滚动圆在钢轨上滚动,使轮对在行进中一面作横向摆动,一面围绕其重心的垂轴来回摇头,这样就形成了一种被称为蛇行运动的波形运动。这种运动是铁路机车车辆的特有运动。
交际运用。根据对话内容及方框中所给的句子补全对话。其中有一项是多余的。 | |
N: That's great, George 1 G: See, here on my glasses. I've added an alarm. N: 2 G: Well, I wanted to make it easier for me to fincl my glasses when they are lost. N: I understand what you mean. I hate it when I can't find what I'm looking for 3 . G: You press a button on the control and the alarm makes a sound. N: And then you follow the sound to where your glasses are 4 George! G: Wait. It gets better. The alarm has small light too. That way you can find your glasses at night. N: An alarm and a light. George, you are a genius (天才). Everyone will use your invention to find their lost glasses. Now, where is the control button? G: Uh, I don't know. I can't find it. N: 5 Uh oh. I think that you need to improve your invention. |