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【单选题】
下列变量名中 是合法的。A.
char_7
B.
m*n
C.
i\j
D.
end
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举一反三
【简答题】What is the opportunity?
【单选题】According to Mr. Hall, what is opportunity cost?
A.
It is the relationship between two kinds of goods or services that customers may want to buy.
B.
It is people's choice of goods and services at similar prices.
C.
It is the relative value of goods to buyers compared to the value of alterative goods and services on which they may want to spend that same amount of money.
【简答题】What is opportunity cost and how opportunity comes out?
【简答题】What is Opportunity Cost?
【简答题】dTMP是由（）经（）修饰作用生成的。
【简答题】What is opportunity?
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