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【单选题】
A worldwide ban on the production of certain ozone-destroying chemicals would provide only an illusion of protection. Quantities of such chemicals, already produced, exist as coolants in millions of refrigerators. When they reach the o-zone layer in the atmosphere, their action cannot be halted. So there is no way to prevent these chemicals from damaging the ozone layer further. Which of the following, if true, most seriously weakens the argument above?A.
It is impossible to measure with accuracy the quantity of ozone-destroying chemicals that exist as coolants in refrigerators.
B.
In modern societies, refrigeration of food is necessary to prevent unhealthy and potentially life-threatening conditions.
C.
Replacement chemicals that will not destroy ozone have not yet been developed and would be more expensive than the chemicals now used as coolants in refrigerators.
D.
Even if people should give up the use of refrigeration, the coolants already in existing refrigerators are a threat to atmospheric ozone.
E.
The coolants in refrigerators can be fully recovered at the end of the useful life of the refrigerators and reused.
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举一反三
【多选题】下列关于资本成本的说法中，正确的有( )。
A.
资本成本的本质是企业为筹集和使用资金而实际付出的代价
B.
企业的加权平均资本成本由资本市场和企业经营者共同决定
C.
资本成本的计算主要以年度的相对比率为计量单位
D.
资本成本可以视为项目投资或使用资金的机会成本
【多选题】1不同产业和国家间的实践(惯例)和政策的标准化不可能通过()而实现
A.
增加不同国家间经济的相互依靠性
B.
政府命令
C.
公司收入和不同国家间的资产基础的扩张
D.
因特网和电子商务
【简答题】空气源热泵发展迅速,其优点是什么?
【简答题】有机药物中常见的易发生自动氧化的基团有( )A. 芳香第一胺; B. 酚羟基; C. 苯环; D. 烯醇; E. 烷烃
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