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【单选题】
欲测定水泥熟料中的SO3含量,由4人分别测定。试样称取2.164g,下列四份报告中合理的是A.
0.02163
B.
0.021634
C.
0.0216
D.
0.022
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【判断题】Public goods tend to be under-provided, while common resources tend to be over-consumed.
A.
正确
B.
错误
【单选题】Utilitarianism is attractive to many because it matches the views we tend to hold when discussing governmental policies and public goods.
A.
True
B.
False
【单选题】The commercial value of ivory is a threat to the elephant, but the commercial value of beef is a guardian of the cow. This is because
A.
a. the cow is raised in developed countries, while the elephant lives primarily in less-developed countries.
B.
b. cows are private goods, while elephants tend to roam freely without owners.
C.
c. cows and elephants are public goods, but ivory is nonrival.
D.
d. ivory is nonrival and nonexclusive, but beef is rival and exclusive.
【简答题】将以下内容翻译成中文: Time Horizon. Goods tend to have more elastic demand over longer time horizons. When the price of gasoline rises, the quantity of gasoline demanded falls only slightly in the first few mon...
【单选题】Which of the following statements is TRUE?
A.
It is possible to observe how much people benefit from consuming an additional unit of a public good.
B.
It is difficult to get an accurate estimate of the marginal social benefits of public goods because individuals have an incentive to distort the truth about their willingness to pay.
C.
Individuals tend to underestimate the amount of a public good that they desire.
D.
It is straightforward to estimate the marginal social benefits of public goods.
【单选题】男性,50岁。6个月发现进食哽噎感,其后症状逐渐加重,近3周只能进全流质,体重减轻,体力下降。查体:脉搏80次/分,血压17/12kPa,体温36、5°C,消瘦,颈、锁骨上淋巴结未触及,化验正常,食管钡剂造影见食管中、下段8cm狭窄,黏膜破坏。该病人最可能的诊断是
A.
食管癌
B.
贲门失弛缓症
C.
食管良性肿瘤
D.
腐蚀性食管灼伤
E.
食管炎
【单选题】男性，50岁。6个月发现进食哽噎感，其后症状逐渐加重，近3周只能进全流质，体重减轻，体力下降。查体：脉搏80次/分，血压17/12kPa，体温36.5℃，消瘦，颈、锁骨上淋巴结未触及，化验正常，食管钡剂造影见食管中、下段8cm狭窄，黏膜破坏。该病人需要采取的治疗措施是
A.
放疗
B.
化疗
C.
手术治疗
D.
放疗加手术治疗
E.
激光治疗
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