微需氧环境下环境的含氧量是A.5% B.10% C.15% D.20% E.25%

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问题:

微需氧环境下环境的含氧量是

A.5%

B.10%

C.15%

D.20%

E.25%

考点:临床医学检验技术士临床检验士相关专业知识初级临床医学检验技士相关专业知识
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圆柱体的底面半径是1厘米、高4厘米,它的表面积是(    )平方厘米。

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一个一面靠墙的直径为8米的半圆形养鸡场,现在要把周围用篱笆围起来(靠墙的一面不围)需要长______米的篱笆.

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国际会展业发展的特点是()。

A、基础设施好;

B、主办者专业化;

C、国际化程度高;

D、重视服务品牌;

E、行业管理到位。

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正常心脏的位置:

A.在胸腔上纵隔内

B.位于右侧胸腔

C.位于横隔下方

D.在胸腔中纵隔内

E.在胸腔后纵隔内

题型:单项选择题

It’s a cliche—but true—that a huge obstacle to a per economic recovery is the lack of confidence in a p recovery. If consumers and businesses were more confident, they would be spending, hiring and lending more freely. Instead, we’re deluged with reports suggesting that, because the recession was so deep, it will take many years to regain anything like the pre-crisis prosperity. Just last week, for example, the McKinsey Global Institute released a study estimating that the country needs 21 million additional jobs by 2020 to reduce the unemployment rate to 5 percent. The study was skeptical that this would happen. Pessimism and slow growth become a vicious cycle.

Battered confidence most obviously reflects the ferocity and shock of the financial collapse and the ensuing recession, including the devastating housing collapse. But there’s another, less appreciated cause: disillusion with modern economics. Probably without realizing it, most Americans had accepted the fundamental promises of contemporary economics. These were: First, we know enough to prevent another Great Depression; second, although we can’t prevent every recession, we know enough to ensure sustained and, for the most part, p recoveries. These propositions, endorsed by most economists, had worked themselves into society’s belief structure.

Embracing them does not preclude economic disappointments, setbacks, worries or risks. But for most people most of the time, it does preclude economic calamity. People felt protected. If you stop believing them, then you act differently. You begin shielding yourself, as best you can, against circumstances and dangers that you can’t foresee but that you fear are there. You become more cautious. You hesitate more before making a big commitment-buying a home or car, if you’re a consumer; hiring workers, if you’re an employer; starting a new business, if you’re an entrepreneur; or making loans, if you’re a banker. Almost everyone is hunkered down in some way.

One disturbing fact from the McKinsey report is this: The number of new businesses, a traditional source of jobs, was down 23 percent in 9,010 from 2007; the level was the lowest since 1983, when America had about 75 million fewer people. Large corporations are standoffish. They have about $2 trillion of cash and securities on their balance sheets, which could be used for hiring and investing in new products.

It’s not that economics achieved nothing. The emergency measures thrown at the crisis in many countries exceptionally low interest rates, "stimulus" programs of extra spending and tax cuts—probably averted another Depression. But it’s also true that there’s now no consensus among economists as to how to strengthen the recovery. Economists suffer from what one of them calls "the pretense-of-knowledge syndrome." They act as if they understand more than they do and presume that their policies, whether of the left or right, have benefits more predictable than they actually are. It’s worth remembering that the recovery’s present slowdown is occurring despite measures taken to speed it up.

So modern economics has been oversold, and the public is now disbelieving. The disillusion feeds stubbornly low confidence.

The high unemployment rate is mainly caused by()

A. the failure of new and small businesses to generate a profit

B. the reluctance of big companies to expand their business

C. the disillusion of people with contemporary economics

D. the improper policy of extremely low interest rates

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