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【简答题】
通常生理学的研究方法分为三个水平,即
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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.
【单选题】以下对视频格式文件的描述中，不正确的是()
A.
ra、rm或rmvb格式是流式视频文件格式，用来在低速率的广域网上实时传输活动视频影像
B.
ra、rm或rmvb格式可以根据网络数据传输速率的不同而采用不同的压缩比率
C.
ra、rm或rmvb格式可实现影像数据的实时传送和实时播放
D.
ra、rm或rmvb格式是Windows公司开发的一种静态图像文件格式
【单选题】A firm's opportunity costs of production are equal to its ：
A.
explicit costs + implicit costs.
B.
explicit costs only
C.
implicit costs only
D.
explicit costs + implicit costs + total revenue
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