道床抵抗轨道框架沿线路方向纵向位移的力称道床纵向阻力。

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问题:

道床抵抗轨道框架沿线路方向纵向位移的力称道床纵向阻力。

考点:铁路线路工技能考试高级线路工高级线路工题库
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两个2.0Ω的电阻串联后接到电源上,通过电阻的电流是1A.把这两个电阻并联起来还接到这个电源上,通过每个电阻的电流是1.5A.

(1)求此电源的电动势E和内电阻r.

(2)当两电阻并联时,求电源的总功率P

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Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (52) an educational institution, and they are required to study for a (53) of fifteen hours a week on a daytime course. Prospective students have to show that they can afford their studies, and that they have sufficient (54) resources to support themselves (55) in this country.

In order to work here the foreigner needs a work permit, (56) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (57) these permits, and there is little that can be done (58) it; it would be extremely unwise for a foreign visitor to work (59) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the European countries, who are often given (60) 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 (61) part-time jobs while they are studying here.

54().

A.natural 

B.financial 

C.human 

D.economical

题型:判断题

有关消化性溃疡出血的处理,下列不恰当的是()

A.胃镜下局部喷洒药物

B.口服止血药

C.通过胃管胃内注入冰盐水

D.胃镜下电凝止血

E.应用促胃动力药如多潘立酮等

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依托小额支付系统办理华东三省一市汇票业务有哪些特点?

题型:判断题

据专家预测,因全球气候变暖,世界海平面到2100年将升高40~50厘米。下图为“我国某地区海陆过渡地带示意图”。

海平面上升对该地带的影响有()

A.加剧农田土壤盐碱化

B.滩涂面积减少

C.淹没部分耕地

D.有利于港口基础设施建设

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