首页
普通专升本
成人高考
学位英语
在线刷题
最近学习
最近学习课程
最强大脑 · 3天挑战极限记...
副标题副标题副标题副
最强大脑 · 3天挑战极限记...
副标题副标题副标题副
您现在位置：
模拟考场
>
学士学位英语
>
学位英语
>
浏览试题
[单选题]
When an earthquake is bigger, we can feel the wall or the ground____.
A
vibrating
B
swinging
C
whirling
D
pulsing
收藏
查看答案
参考答案
试题答案：
A
答案解释：
相关题目
The Americans celebrate Christmas____ the Chinese celebrate the Spring Festival.
She is very good ______people from all walks of life.(1分)
22.4 From the lastparagraph, we can learn that .(2分)
9. (A)in (B)into (C)around (D)round
We had no sooner sat down______ we found it was time to go.(1分)
3. (A)influenced (B)inherited (C)affected (D)protected
3. A.results B.places C.books D.conclusions
3.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1Friction arises when____.(1分)A. an opposing force of motion existsB. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
While freshmen are considered part of the academic elite, some of them appear to lack common sense____ following traffic regulations.
7.The factory operated ( )until the order was filled.
热门试题
1.
预算约束
2.
21.持票人将汇票提交付款人要求承兑的行为是
3.
Who cooks dinner?
4.
由人类活动引起的环境问题是（ ）
5.
首先提出预备情绪理论的是（）
热门试卷
成人高考专升本《政治》模拟试卷
去做题
已有3411做题
2020年湖北成人高考专升本政治模拟试题三
去做题
已有2205做题
成人高考专升本政治考试模拟试题及答案(1)
去做题
已有1893做题
湖北成考专升本政治真题（2021年）
去做题
已有1331做题
成人高考高起点语文考试高分突破试题及答案四
去做题
已有1190做题
