综合考虑下表中各方面的因素,通过分析回答以下问题: 金属全球年产量104t密度

题型:问答题

问题:

综合考虑下表中各方面的因素,通过分析回答以下问题:

金属全球年产量104t密度

103kg/m3

熔点℃导热性能

1为最强,9为最弱

导电性能

1为最强,9为最弱

市场价格

大约元/t

150002.76604416000
80008.910832217700
219.310633388000000
钢铁3014307.91540872200
300011.3327994900
8008.9145376103000
810.5961111365000
(1)哪两种金属的导电性能好?在你认为导电性能好的金属中,哪种更适宜做导线?为什么?

(2)通过综合分析上表的各项指标,请写出你所发现的一条规律.

考点:影响电阻大小的因素物质的三态及其基本特征
题型:问答题

下列描述错误的是( )。

A.继承分为多重继承和单继承

B.对象之间的通信靠传递消息来实现

C.在外面看不到对象的内部特征是基于对象的“模块独立性好”这个特征

D.类是具有共同属性、共同方法的对象的集合

题型:问答题

潮式呼吸的特点是()

A.呼吸浅慢,逐渐加快加深,再度变浅变慢,呼吸暂停,然后再周而复始

B.呼吸深、呼吸浅慢、呼吸暂停,三者交替出现

C.呼吸深、呼吸暂停、呼吸浅慢,三者交替出现

D.呼吸暂停、呼吸增强、呼吸减弱,反复出现

E.呼吸减弱、呼吸增强、呼吸暂停,反复出现

题型:问答题

振动式密度计的传感线圈作用是检测出(),求得被测液体的密度。

A、振动管的振荡周期

B、流经振动管液体的质量

C、振动管振荡幅值大小

D、振动管温度发生的变化

题型:问答题

Almost everyone agrees that America’s health-care system has the incentives all wrong. Under the present system, doctors and hospitals get paid for doing more, even if added tests, operations and procedures have little chance of improving patients’ health. So what happens when someone proposes that we alter the incentives to reward better care, not more care Well, Rep. Paul Ryan and Republicans found out. No surprise: Democrats slammed them for "ending Medicare as we know it. "

This predictably partisan reaction preying upon the anxieties of retirees—must depress anyone who cares about the country’s future. It is only a slight exaggeration to say that unless we end Medicare "as we know it," America "as we know it" will end. Spiraling health spending is the crux of our federal budget problem. In 1965—the year Congress created Medicare and Medicaid—health spending was 2.6 percent of the budget. In 2010, it was 26.5 percent. The Obama administration estimates it will be 30.3 percent in 2016. By contrast, defense spending is about 20 percent; scientific research and development is 4 percent.

Uncontrolled health spending isn’t simply crowding out other government programs; it’s also dampening overall living standards. Health economists Michael Chernew, Richard Hirth and David Cutler recently reported that higher health costs consumed 35.7 percent of the increase in per capita income from 1999 to 2007. They also project that, under reasonable assumptions, it could absorb half or more of the gain between now and 2083.

Ryan proposes to change that. Beginning in 2022, new (not existing) Medicare beneficiaries would receive a voucher, valued initially at about $ 8,000. The theory is simple. Suddenly empowered, Medicare beneficiaries would shop for lowest-cost, highest-quality insurance plans providing a required package of benefits. The health-care delivery system would be forced to restructure by reducing costs and improving quality. Doctors, hospitals and clinics would form networks; there would be more "coordination" of care, helped by more investment in information technology; better use of deductibles and co-payments would reduce unnecessary trips to doctors’ offices or clinics.

It’s shock therapy. Would it work No one knows, but two things are clear. First, as Medicare goes, so goes the entire health-care system. Medicare is the nation’s largest insurance program, with 48 million recipients and spending last year of $ 520 billion. Second, few doubt that today’s health-care system has much waste: medical care that does no good.

Under Ryan’s plan, incentives would shift. Medicare would no longer be an open ATM; the vouchers would limit total spending. Providers would face pressures to do more with less; there would certainly be charges that essential care was being denied. The Obama administration argues that better results can be achieved by modifying incentives within the existing system. Perhaps. But history suggests skepticism. It’s Ryan’s radicalism vs. President Obama’s remedy policy. Which is realistic and which is wishful thinking Burdened by runaway spending, Medicare "as we know it" is going to end. The only questions are when and on whose terms.

The text is written to answer the question()

A. Is Obama’s health-care policy wishful thinking

B. On whose terms should new medicare plan be formulated

C. Why is Ryan’s medicare plan too radical

D. Why must we end medicare "as we know it"

题型:问答题

韦达夫斯基研究具有很强的控制论色彩,因此,他的研究视角属于()。

A.自下而上的研究视角

B.理论视角

C.实践视角

D.自上而下的研究视角

更多题库