鞋底、轮胎上有凹凸不平的花纹,使接触面______,以增大有益的______.

题型:填空题

问题:

鞋底、轮胎上有凹凸不平的花纹,使接触面______,以增大有益的______.

考点:增大或减小摩擦的方法
题型:填空题

下列几组电阻串联后,总电阻最小的一组是(    )

A.30欧和15欧

B.20欧和15欧

C.10欧和15欧

D.5欧和15欧

题型:填空题

下面说法不正确的是[ ]

A.三角形的面积一定,底和高成反比例

B.长方形的周长一定,长和宽不成比例

C.订阅《少年报》的份数和总钱数成正比例 

D.因为圆周长C= πd,所以π与d成反比例

题型:填空题

口服胆囊造影所用的造影剂为

A.胆影葡胺

B.泛影葡胺

C.胆影钠

D.钆喷酸葡胺

E.碘番酸

题型:填空题

I refuse to accept the blame for something________was someone else’s fault.

A.who

B.that

C.as

D.what

题型:填空题

Why does most of the world travel on the right side today? Theories differ, but there’s no doubt that Napoleon was a major influence. The French had used the right since at least the late 18th century. Some say that before the French Revolution, noblemen drove their carriages on the left, forcing the peasants to the right. Regardless of the origin, Napoleon brought right-hand traffic to the nations he conquered, including Russia, Switzerland and Germany. Hitler, in turn, ordered right-hand traffic in Czechoslovakia and Austria in the 1930s. Nations that escaped right-hand control, like Great Britain, followed their left-hand tradition.

The U.S. has not always been a nation of right-hand rivers; earlier in its history, carriage and horse traffic traveled on the left, as it did in England. But by the late 1700s, people driving large wagons pulled by several pairs of horses began promoting a shift to the right. A driver would sit on the rear (后面的) left horse in order to wave his whip with his right hand; to see opposite traffic clearly, they traveled on the right.

One of the final moves to firmly standardize traffic directions in the U.S. occurred in the 20th century, when Henry Ford decided to mass-produce his cars with controls on the left (one reason, stated in 1908; the convenience for passengers exiting directly onto the edge, especially… if there is a lady to be considered). Once these rules were set, many countries eventually adjusted to the right-hand standard, including Canada in the 1920s, Sweden in 1967 and Burma in 1970. The U.K. and former colonies such as Australia and India are among the western world’s few remaining holdouts. Several Asian countries, including Japan, use the left as well — thought many places use both right-hand-drive and left-hand-drive cars.

小题1:Why did people in Switzerland travel on the right?

A.They had used the right-hand since the 18th century.

B.Rich people enjoyed driving their carriages on the right.

C.Napoleon introduced the right-hand traffic to this country.

D.Hitler ordered them to go to against their left-hand tradition.小题2:Of all the countries below, the one that travels on the right is ______.

A.Austria

B.England

C.Japan

D.Australia小题3:Henry Ford produced cars with controls on the left _______.

A.in order to change traffic directions in the U.S.

B.so that passengers could get off conveniently

C.because rules at that time weren’t perfect

D.though many countries were strongly against that小题4:According to the passage, which of the following is TRUE?

A.Before the French Revolution, all the French people used the right.

B.People in Britain and the U.S. travel on the same side nowadays.

C.The Burmese began to travel on the right in 1970.

D.All the Asian nations use the left at present.小题5:What would be the best title for this passage?

A.Who made the great contributions to the shift of traffic directions?

B.How cars have become a popular means of transportation?

C.How Henry Ford produced his cars with controls on the left?

D.Why don’t people all drive on the same side of the road?

更多题库