问答题

DBMS采用的候选键称为（）。

答案：主键

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单项选择题

If Bradley’s Butcher Shop sells its product in a competitive market, then
A、the price of that product depends on the quantity of the product that Bradley’s Butcher Shop produces and sells because the firm’s demand curve is downward sloping.
B、Bradley’s Butcher Shop's total cost must be a constant multiple of its quantity of output.
C、Bradley’s Butcher Shop's total revenue must be proportional to its quantity of output.
D、Bradley’s Butcher Shop's total revenue must be equal to its average revenue.