若活塞、活塞环与气缸套间的磨合不良,或(),使得机油上窜到燃烧室燃烧,发动机冒蓝烟。

题型:填空题

问题:

若活塞、活塞环与气缸套间的磨合不良,或(),使得机油上窜到燃烧室燃烧,发动机冒蓝烟。

考点:大型线路机械司机考试大型线路机械司机技师大型线路机械司机技师题库
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列调控制盒为列尾控制盒提供的电源,通常为()V。

A、+6

B、+9

C、+13.8

D、+24

题型:填空题

火星和地球的距离约为34 000 000千米,用科学记数法表示34 000 000的结果是(  )千米.

A.0.34×108

B.3.4×106

C.34×106

D.3.4×107

题型:填空题

肿瘤

题型:填空题

Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (51) an educational institution, and they are required to study for a minimum of fifteen hours a week on a (52) course. Prospective students have to show that they can afford their studies, and that they have sufficient (53) resources to support themselves (54) in this country.

In order to work here the foreigner needs a work permit, (55) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (56) these permits, and there is little that can be done (57) it; it would be extremely unwise for a foreign visitor to work (58) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the Common Market countries, who are often given (59) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (60) part-time jobs while they are studying here.

60().

A.engage 

B.take 

C.expect 

D.review

题型:填空题

有国外学者说,如果世界结束于1820年,一部此前300年全球经济史的主体就会是东亚;只有结尾的简短一章可能提到遥远的大西洋沿岸。大西洋沿岸可能被提及的主要原因是()

A.新航路开辟扩大了世界贸易

B.西方早期殖民扩张扩大了资本原始积累

C.工业革命使欧洲迅速崛起

D.第二次工业革命创造了巨大的社会财富

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