属于石油的物理性质是()。A、深色原油密度大、粘度高 B、刺鼻的臭味 C、在加热条件下烷

题型:多项选择题

问题:

属于石油的物理性质是()。

A、深色原油密度大、粘度高

B、刺鼻的臭味

C、在加热条件下烷烃会发生碳链断裂

D、石油不溶于水

考点:石油地震勘探工石油地震勘探工高级石油地震勘探工高级题库
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颤证之风阳内动型,其治法是()

A.补肾助阳,温煦筋脉

B.镇肝熄风,舒筋止颤

C.清热化痰,平肝熄风

D.益气养血,濡养筋脉

E.填精补髓,育阴熄风

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包馅法根据品种特点,又可分为()。

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下列各机械设备零件中,具有自锁性的是( )。

A.螺栓

B.键

C.轴承

D.销

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在改革开放前和改革开放后两个历史时期中,我们在思想指导、方针政策、实际工作上有很大差别,但两者决不是彼此割裂的、更不是根本对立的。

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Part 1


·Read thefollowingpassage, eight sentences have been removed from the article.
·Choose from the sentences A-H the one whichfits each gap.
·For each gap (1-8) mark one letter (A-H) on the Answer Sheet.
·Do not mark any letter twice.
The single, decisive factor that made it possible for mankind to settle in permanent communities was agriculture. (1) Once people could control the production of food and be assured of a reliable annual supple of it, their lives changed completely.
Fanning was a revolutionary discovery. (2) With more food available, more people could be fed. Populations therefore increased. The growing number of people available for more kinds of work led to the development of more complex social structures. (3)
Farming the world over has always relied upon a dependable water supply. For the earliest societies this meant rivers and streams or regular rainfall. (4) Later communities were able to develop by taking advantage of the rainy seasons.
All of the ancient civilizations probably developed in much the same way, in spite of regional and climatic differences. (5) Heavier pottery replaced animal-skin gourds as containers for food and liquids. Cloth could be woven from wool and flax. Permanent structures made of wood, brick, and stone could be erected.
The science of mathematics was an early outgrowth of agriculture. People studied the movements of the moon, the sun, and planets to calculate seasons. (6) With a calendar it was possible to calculate the arrival of each growing season. Measurement of land areas was necessary if property was to be a factor in farming and housekeeping. (7) All of the major ancient civilizations in Mesopotamia, Egypt, the Indus Valley, and China emerged in the 4th millennium BC. Historians still debate over which one emerged first. It may well have been the Middle East, in an area called the Fertile Crescent. This region stretches from the Nile River in Egypt northward along the coast of former Palestine, then eastward into Asia to include Mesopotamia. (8) This kind of larming depended on the reproduction of seed, normally from grain crops.
A. It not only made settlements possible and ultimately the building of cities but it also made available a reliable food supply.
B. Later came measures of value as commodity and money exchange became common.
C. In this area people settled along the riverbanks and practiced field agriculture.
D. After farming was developed in the Middle East in about 6500 BC, people living in tribes or family units did not have to be on the move continually searching for food or herding their animals.
E. As villages grew, the accumulation of more numerous and substantial goods became possible.
F. With a food surplus, a community could support a variety of workers who were not farmers.
G. The first great civilizations grow up along rivers.
H. In doing so they created the first calendars.

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