下面()不是产生流挂的原因。A、油漆过稀 B、喷涂过厚 C、干度太慢 D、漆质不良

题型:单项选择题

问题:

下面()不是产生流挂的原因。

A、油漆过稀

B、喷涂过厚

C、干度太慢

D、漆质不良

考点:桥隧工考试高级桥隧工高级桥隧工题库
题型:单项选择题

下列哪种肿瘤属于良性?()

A.神经鞘瘤

B.精原细胞瘤

C.黑色素瘤

D.淋巴瘤

E.肾母细胞瘤

题型:单项选择题

裁决委员会一般在关键施工作业期间到现场考察,但两次考察的间隔时间不少于( )天。

A.80
B.100
C.120
D.140

题型:单项选择题

由甲、乙、丙、丁四个人组成的代表队参加数学竞赛,已知甲比乙、丙、丁三人的平均分高2分;乙比甲、丙、丁三人的平均分低3分,丙比甲、乙、丁三人的平均分高3分,则丁比甲、乙、丙三人的平均分()。

A.高两分

B.低两分

C.低三分

D.高三分

题型:单项选择题

造成电弧产生磁偏吹的原因有以下几种()。

A.接地线位置不正确引起的电弧偏吹、铁磁性物质引起的磁偏吹、焊条与工件的相对位置不对称引起的电弧偏吹

B.接地线位置不正确引起的电弧偏吹、铁磁性物质引起的磁偏吹、电弧周围气流的干扰引起的偏吹

C.焊条偏向度过大引起的电弧偏吹、铁磁性物质引起的磁偏吹、焊条与工件的相对位置不对称引起的电弧偏吹

D.焊条偏向度过大引起的电弧偏吹、铁磁性物质引起的磁偏吹、使用交流机焊接引起的电弧偏吹

题型:单项选择题

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 Mesopotami
  • a. (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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