运动时心率增快,表明窦房结自律性增加。在静息状态下,自主神经对窦房结自律性的调节起主

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问题:

运动时心率增快,表明窦房结自律性增加。

在静息状态下,自主神经对窦房结自律性的调节起主导作用的是()

A.迷走神经张力增高

B.迷走神经张力减低

C.交感神经张力增高

D.交感神经张力减低

E.以上都不对

考点:心血管内科(医学高级)心脏电生理检查及治疗心脏电生理检查及治疗题库
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铁路边界噪声限值昼夜间相同,均为( )dB(A)。

A.60

B.65

C.70

D.75

题型:单项选择题 共用题干题

阅读下面短文,回答下 * * 道题。

作家有三种死法。一曰自然的死,二曰痛苦的死,三曰快乐的死。

自然的死属于心脏停止跳动,是一种普遍的死亡形式,没有特色,可以略而不议。快乐的死和痛苦的死不属于心脏停止跳动,是人还活着,作品已经或几乎是没有了!

作家没有了作品,可以看作是个人艺术生命的死亡、职业的停顿。其中有些人是因为年事已高,力不从心。这不是艺术的死亡,而是艺术的离休,他自己无可自责,社会也会尊重他在艺术上曾经做出的贡献。

痛苦的死亡却不然,即当一个作家的体力和脑力还能胜任创作的时候,作品已经没有了,其原因主要是由于各种苦难和折磨(包括自我折磨)所造成的。折磨毁了他的才华,苦难消沉了意志,作为人来说他还活着,作为作家来说却正在或已经死亡。这种死亡他自己感到很痛苦,别人看了心里也很难受。

快乐的死亡却很快乐,不仅他自己感到快乐,别人看来也很快乐。昨天看见他大会上作报告,下面掌声如雷;今天又看见他参加宴会,为这为那地频频举杯。昨天看见他在高朋中大发议论,语惊四座;今天又看见他在那些开不完的座谈会上重复昨天的意见。昨天看见他在北京的街头;今天又看见他飞到了广州……只是看不到或很少看到他的作品发表在哪里。

我不害怕自然的死亡,因为害怕也没用,人人不可避免。我也不太害怕痛苦的死亡,因为那时代已经过去。我最害怕的就是那快乐的死亡,毫无痛苦,十分热闹,甚至还有点轰轰烈烈。自己很难控制,即很难控制在一定的范围之内。因为我觉得喝酒不一定完全是坏事,少喝一点可以舒筋活血,据说对心血管也是有帮助的。作家不能当隐士,适当的社会活动和文学活动可以开阔眼界、活跃思想,对创作也是有帮助的。可是怎么才能不酗酒,不做酒鬼,这有益的定量究竟是多少呢

怕只怕三杯下肚,豪情大发,嘟嘟嘟,来个瓶底朝天,而且一顿喝不上便情绪不高,颇有怨言,甚至会到处去找酒喝。呜呼,快乐地死去!

简要概括作者对三种死亡所持的态度()。

A.对自然的死亡,不怕,因为不可避免;对痛苦的死亡,以前是无可奈何,现已不太害怕;对快乐的死亡,十分忧虑,非常蔑视

B.对自然的死亡,害怕,因为可以避免;对痛苦的死亡,以前是无可奈何,现已不太害怕;对快乐的死亡,十分忧虑,非常蔑视

C.对自然的死亡,不怕,因为不可避免;对痛苦的死亡,很害怕;对快乐的死亡,十分忧虑,非常蔑视

D.对自然的死亡,不怕,因为不可避免;对痛苦的死亡,以前是无可奈何,现已不太害怕;对快乐的死亡,很喜欢

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回填土中轻微风化、尺寸大于40cm的石料,其边坡分排整齐,填方高度在5m以内时,边坡坡度为1:1.50()

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凡属省调管辖线路出线刀闸以外的省调值班调度员下令操作的线路接地刀闸(),由();出线刀闸以内的接地刀闸(),由厂、站值班人员操作管理;检修人员在线路上装的工作地线,由()操作管理。

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It is no longer just dirty blue-collar jobs in manufacturing that are being sucked offshore but also white-collar service jobs, which used to be considered safe from foreign competition. Telecoms charges have tumbled, allowing workers in far-flung locations to be connected cheaply to customers in the developed world. This has made it possible to offshore services that were once non-tradable. Morgan Stanley’s Mr. Roach has been drawing attention to the fact that the "global labour arbitrage" is moving rapidly to the better kinds of jobs. It is no longer just basic data processing and call centres that are being outsourced to low-wage countries, but also software programming, medical diagnostics, engineering design, law, accounting, finance and business consulting. These can now be delivered electronically from anywhere in the world, exposing skilled white-collar workers to greater competition.

The standard retort to such arguments is that outsourcing abroad is too small to matter much. So far fewer than lm American service-sector jobs have been lost to off-shoring. Forrester Research forecasts that by 2015 a total of 3.4m jobs in services will have moved abroad, but that is tiny compared with the 30m jobs destroyed and created in America every year. The trouble is that such studies allow only for the sorts of jobs that are already being off-shored, when in reality the proportion of jobs that can be moved will rise as IT advances and education improves in emerging economies.

Alan Blinder, an economist at Princeton University, believes that most economists are underestimating the disruptive effects of off-shoring, and that in future two to three times as many service jobs will be susceptible to off-shoring as in manufacturing. This would imply that at least 30% of all jobs might be at risk. In practice the number of jobs off-shored to China or India is likely to remain fairly modest. Even so, the mere threat that they could be shifted will depress wages:

Moreover, says Mr. Blinder, education offers no protection. Highly skilled accountants, radiologists or computer programmers now have to compete with electronically delivered competition from abroad, whereas humble taxi drivers, janitors and crane operators remain safe from off-shoring. This may help to explain why the real median wage of American graduates hat fallen by 6% since 2000, a bigger decline than in average wages.

In the 1980s and early 1990s, the pay gap between low-paid, low-skilled workers and high-paid, high-skilled workers widened significantly. But since then, according to a study by David Autor, Lawrence Katz and Melissa Kearney, in America, Britain and Germany workers at the bottom as well as at the top have done better than those in the middle-income ’group. Office cleaning cannot be done by workers in India. It is the easily standardised skilled job in the middle, such as accounting, that are now being squeezed hardest. A study by Bradford Jensen and Lori Kletzer, at the Institute for International Economics in Washington D. C., confirms that workers in tradable services that are exposed to foreign competition tend to be more skilled than workers in non-tradable services and tradable manufacturing industries.

Which of the following could be the best title for the text()

A. Business consulting

B. Blue-collar jobs

C. Non-tradable services

D. White-collar blues

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