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货车落车后对转8A型转向架与轨面垂直距离有何技术要求？

答案

参考答案：

转向架各垂下品与轨面最小距离：钢轨内侧为50mm，钢轨外侧为80mm，闸瓦销环为25mm。

完形填空

Cell phones are so cheap that almost all people can afford it. _____ you go, you can see people holding cell phones doing different things. Our life style has changed greatly  _____ of the widespread of mobile phones.

Mobile phones change _____ way we contact others. In the past, we contacted our families, relatives and friends by writing letters _____ just going to a certain area to make a phone call. Now, if we want to contact them, all we need to do is to take out our cell phone, dial the number and then we can reach _____ in a minute.

With a cell phone, we _____ take photos and locate ourselves easily. All cell phones have a camera function. We can take photos anywhere we want and do _____ need to take our camera. Besides, _____ we are lost, we can use a cell phone to locate ourselves and find the right direction.
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多项选择题

可动铰支座的特点是（）。

A.约束杆端不能移动

B.允许杆端沿一个方向移动

C.允许杆端转动

D.只有一个反力

E.只有一个约束力偶
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