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【单选题】
控制和消除生产性毒物常采取的措施，不包括A.
工艺改革，以无毒代有毒、低毒代高毒
B.
生产过程机械化、自动化、密闭化
C.
厂房建筑和生产过程的合理安排
D.
加强通风排毒
E.
个体防护
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【简答题】2009年12月3日开工建设的大同至西安铁路客运专线，线路全长859km，山西省境内正线长为710km，陕西省境内正线长为149km。全线桥隧比例约占线路全长的78%，共设车站29个，途径9个地级市，2013年底竣工。届时，大同至西安旅客列车运行时间将由现在的17小时压缩至3小时左右。据此完成题。 小题1:大西高铁桥梁和隧道占线路总长度近五分之四，主要原因包括（ ） ①沿线多低山、丘陵 ②高...
【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
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