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【单选题】
关于国际民用航空公约,下列说法不正的是A.
国际航空法的第一层次
B.
缔约国享有公约规定的权利并承担相应的义务
C.
具有法律效力
D.
有缔约国缔结，对所有国家都有法律效力
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举一反三
【单选题】A firm's opportunity costs of production are equal to its
A.
explicit costs only.
B.
implicit costs only.
C.
explicit costs + implicit costs.
D.
explicit costs + implicit costs + total revenue.
【简答题】Avoidable costs, differential costs and opportunity costs are examples of ______costs.
【单选题】According to the passage, what are the opportunity costs of an item?
A.
The amount of time and money spent in producing it.
B.
The opportunities a person has to buy it.
C.
The value of what could have been produced instead.
D.
The value of the resources used in its production.
【简答题】写出题1．20图所示各系统的微分或差分方程。 [*] 题1．20图
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