二茂铁分子[Fe(C5H5)2]是一种金属有机配合物,是燃料油的添加剂,用以提高

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问题:

二茂铁分子[Fe (C5H52]是一种金属有机配合物,是燃料油的添加剂,用以提高燃烧的效率和去烟,可作为导弹和卫星的涂料等.它的结构如图所示,下列说法正确的是(  )

A.二茂铁中Fe2+与环戊二烯离子(C5H5-)之间为离子键

B.Fe元素在周期表中的位置是第四周期ⅧA

C.Fe2+的电子排布式为1s22s22p63s23p63d6

D.1mol环戊二烯(

)中含有σ键的数目为5NA,π键的数目是2NA

考点:电子排布式原子核外电子的排布共价键离子键
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住宅环境对健康影响的特点()。

A.主要是影响人们的生活、居住、学习、工作

B.主要是影响小气候

C.主要是具有长期性和复杂性,表现为慢性、潜在性和功能上的不良影响

D.主要是对新迁入居住的家庭成员的健康产生影响

E.主要是影响日照、采光、噪声、绿化和空气清洁状况等

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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.

Which of the following statements is the typical reply concerning off-shoring
[A] Service-sector has sustained a great loss.
[B] White-collar workers will not have a narrow escape.
[C] Most economists underestimated the effects of off-shoring.
[D] Outsourcing abroad has no significant impact.


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 has fallen by 6% since 9000, 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 jobs 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.

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《松材线虫病普查抽样检测办法》规定,在树干()、()、()三个部位取样。当年死树应尽量在松褐天牛侵入孔或蛀道部位附近取样。

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请回答合谷、大椎的定位、归经及操作。

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一次产卵鱼类与分批产卵鱼类的Ⅳ期卵巢没有显著差别。

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