问题 问答题

某机器设备原始成本为100000元,报废时残余价值估计为6000元,该设备运转费用每年比前一年增加650元,试用低劣化数值法,求此设备的经济寿命和设备在最佳使用年限中的年均设备总费用。

答案

参考答案:

因为原始价值为100 000元,即K0=100 000元,残余价值为6 000元,即Q1=6 000元,

所以,T年年平均设备费为=(100 000-6 000)/T=94000/T,

因为运转费用每年增加650元,即λ=650元

所以,T年年平均劣化值为=(T+1)×650/2

年均设备费用C=

根据经济寿命公式,T0==17.01(年),取整为17年,

代回年平均设备总费用公式得:

年均设备总费用C==11 379.41(元)

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单项选择题

It is said that in England death is pressing, in Canada inevitable and in California optional. Small wonder. Americans’ life expectancy has nearly doubled over the past century. Failing hips can be replaced, clinical depression controlled, cataracts removed in a 30-minute surgical procedure. Such advances offer the aging population a quality of life that was unimaginable when I entered medicine 50 years ago. But not even a great health-care system can cure death—and our failure to confront that reality now threatens this greatness of ours.

Death is normal; we are genetically programmed to disintegrate and perish, even under ideal conditions. We all understand that at some level, yet as medical consumers we treat death as a problem to be solved. Shielded by third-party payers from the cost of our care we demand everything that can possibly be done for us, even if it’s useless. The most obvious example is latestage cancer care. Physicians—frustrated by their inability to cure the disease and fearing loss of hope in the patient—too often offer aggressive treatment far beyond what is scientifically justified.

In 1950, the U. S. spent $12.7 billion on health care. In 2002, the cost will be $1,540 billion. Anyone can see this trend is unsustainable. Yet few seem willing to try to reverse it. Some scholars conclude that a government with finite resources should simply stop paying for medical care that sustains life beyond a certain age—say 83 or so. Former Colorado governor Richard Lamm has been quoted as saying that the old and infirm "have a duty to die and get out of the way" so that younger, healthier people can realize their potential.

I would not go that far. Energetic people now routinely work through their 60s and beyond, and remain dazzlingly productive. At 78 Viacom chairman Sumner Redstone jokingly claims to be 53. Supreme Court Justice Sandra Day O’Connor is in her 70s, and former surgeon general C. Everett Koop chairs an Internet start-up in his 80s. These leaders are living proof that prevention works and that we can manage the health problems that come naturally with age. As a mere 68-year-old, I wish to age as productively as they have.

Yet there are limits to what a society can spend in this pursuit. As a physician, I know the most costly and dramatic measures may be ineffective and painful. I also know that people in Japan and Sweden, countries that spend far less on medical care, have achieved longer, healthier lives than we have. As a nation we may be overfunding the quest for unlikely cures while underfunding research on humbler therapies that could improve people’s lives.

The text intends to express the idea that ().

A. medicine will further prolong people’s lives

B. life beyond a certain limit is not worth living

C. death should be accepted as a fact of life

D. excessive demands increase the cost of health care