更换折角塞门时,折角塞门体中心线与主管垂直中心线夹角须为()°,C80系列敞车及有特

题型:单项选择题

问题:

更换折角塞门时,折角塞门体中心线与主管垂直中心线夹角须为()°,C80系列敞车及有特殊要求者除外。

A.45

B.30

C.60

D.55

考点:货车检车员考试货车检车员综合练习货车检车员综合练习题库
题型:单项选择题

One of the most famous scientists to study adaptations (适应能力) was Charles Darwin (达尔文). He was born in England in 1809. He wasn't the best student in his school, but when he was 16, his father sent him to a medical school. Charles liked spending time outdoors observing (观察) nature more than attending medical classes and dropped out(辍学) without graduating.

Next, Charles' father sent him to school to become a minister (牧师). This time he made it to graduation. But he didn't want to do the work of a minister. His friends encouraged him to follow his interest in science.

After graduation, Charles was invited to sail on the Beagle as an unpaid scientist. He wasn't the first choice, but he was the lucky one to go. The Beagle was to travel to South America and then around the world. The crew's task was to make maps of the places they visited.

On December 27th, 1831 Charles Darwin sailed from England on the Beagle. The trip was planned to last two years. In fact, it lasted five. During this time, he saw many amazing things. He collected lots of plants and animals and took them back to England to study.

Twenty-three years later, Darwin published a scientific paper with another man named Wallace. Darwin described how some animals have adaptations that help them survive. They are passed on to offspring (后代). Darwin’s ideas about adaptations are still very important to the study of living things.

小题1:Darwin was very interested in _____.

A.attending medical classes

B.the work of a minister

C.sailing around the world

D.science小题2:The Beagle was a(an) _____.

A.ship

B.plane

C.plant

D.animal小题3:When Darwin published the scientific paper, he was _____ years old.

A.twenty-three

B.twenty-two

C.forty-five

D.fifty小题4:The underlined word "they" in the last paragraph refers to (指的是) _____.

A.adaptations

B.Darwin and Wallace

C.animals

D.Darwin's ideas小题5:Which of the following is true?

A.Darwin graduated from a medical school.

B.Some animals have adaptations so that they can survive.

C.Darwin published a scientific paper by himself.

D.Darwin was first chosen to sail on the Beagle.

题型:单项选择题

In order to get happiness, many people chase after reputation or money aimlessly. However, in most cases, real happiness is actually _________.

A.at ease

B.at hand

C.at length

D.at random

题型:单项选择题

()不是万向传动装置抖动的原因。

A、传动轴动不平衡

B、万向节十字轴装配过紧

C、中间支撑轴承支架安装偏斜

D、中间支撑轴承滚道磨损严重

题型:单项选择题

大便次数增多,大便黏稠()

A.糖尿病 

B.地方性甲状腺功能减低症 

C.散发性甲状腺功能减低症 

D.甲状腺功能亢进 

E.单纯性甲状腺肿

题型:单项选择题

市场主体登记的原则有哪些?()

A、合法原则

B、公开原则

C、公平原则

D、效率原则

E、便民原则

F、信赖保护原则

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