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【多选题】
请问下列哪些选项是机会成本的存在需要的前提条件A.
资源是稀缺的
B.
资源具有多种生产用途；
C.
资源的投向不受限制
D.
生产资源本身必须是有代价的
E.
资源具有单一生产用途
F.
资源的投向受限制
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举一反三
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【单选题】What does the underlined word mean? It was a stroke of luck that I found you here.
A.
stroke (of sth): a single successful action or
B.
stroke: a sudden serious illness when a blood vessel in the brain bursts or is blocked, which can cause death or the loss of the ability to move or to speak clearly
C.
stroke: a mark made by moving a pen, brush, etc. once across a suce
D.
stroke: a style of swimming
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【多选题】Public Health Emergency of International Concern (PHEIC) is defined by WHO under the International Health Regulations (2005) (IHR 2005) as "An extraordinary which is determined to constitute a p...
A.
serious, sudden, unusual or unexpected
B.
carries implications for public health beyond the affected State's national border
C.
may require immediate international action
D.
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