题目内容

边际成本曲线穿过规模经济点。

A. 对
B. 错

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交通运输业长期平均成本曲线是平滑的“包络线”。

A. 对
B. 错

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长期成本中没有固定成本。

A. 对
B. 错

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Which of the following statements about dengue virus is not true?

A. It is the most important mosquito-borne viral disease affecting humans
B. It is distributed worldwide in tropical regions
C. It can cause a severe hemorrhagic fever
D. There is a single antigenic type
E. One form of disease is characterized by increased vascular permeability

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The clinical picture of arbovirus infection fits one of three categories: encephalitis, hemorrhagic fever, or fever with myalgia. One of the characteristics of arbovirus is that they

Are transmitted by arthropod vectors
B. Are usually resistant to ether
C. Usually cause symptomatic infection in humans
D. Are closely related to parvoviruses

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边际成本曲线穿过规模经济点。

A. 对 B. 错

交通运输业长期平均成本曲线是平滑的“包络线”。

长期成本中没有固定成本。

Which of the following statements about dengue virus is not true?

The clinical picture of arbovirus infection fits one of three categories: encephalitis, hemorrhagic fever, or fever with myalgia. One of the characteristics of arbovirus is that they

A. 对
B. 错