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【单选题】
上消化道出血病因诊断的首选检查为A.
X线钡餐造影
B.
选择性动脉造影
C.
内镜检查
D.
大便隐血试验
E.
吞线试验
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反馈参考答案：
举一反三
【单选题】An economic profit of zero implies:
A.
normal profit.
B.
the firm is covering both explicit and implicit costs.
C.
the firm's revenues are sufficient to compensate the money and time that the owners put into the business.
D.
all of the above
【单选题】When marginal profit equals zero:
A.
the firm can increase profits by increasing output.
B.
the firm can increase profits by decreasing output.
C.
marginal revenue equals average revenue.
D.
profit is maximized.
【简答题】长期零经济利润条件(long-run zero-profit condition)
【单选题】In economic analysis, any amount of profit earned above zero is considered "above normal" because:
A.
normally firms are supposed to earn zero profit.
B.
this would indicate that the firm's revenue exceeded both its accounting and opportunity cost.
C.
this would indicate that the firm was at least earning a profit equal to its opportunity cost.
D.
this would indicate that the firm's revenue exceeded its accounting cost.
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