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【单选题】
A. ch ocolate B . s ch ool C . rea ch D . c at chA.
ch ocolate
B.
B ． s ch ool
C.
C ． rea ch
D.
D ． c at ch
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【单选题】Which of the following arguments about the efficiency of monopolistic competition in allocating resources is most accurate?
A.
Since economic profits in the long run are positive for firms in monopolistic competition, there are efficiency losses.
B.
Product differentiation under monopolistic competition offers benefits that tend to offset inefficiency from the reduction in output compared to perfect competition.
C.
Advertising expenditures under monopolistic competition represent a deadweight loss to society.
【单选题】How does monopolistic competition differ from perfect competition?
A.
There are more sellers in a market characterized by monopolistic competition.
B.
It is easier for sellers to enter a market or industry characterized by monopolistic competition.
C.
In a perfectly competitive market, products are more dissimilar.
D.
In a market characterized by monopolistic competition, individual firms have some control over price.
E.
In a perfectly competitive market, the size of the firms must be large.
【简答题】用压力法测量开口容器液位时，液位的高低取决于（），用压力法测量开口容器液位的依据是：液位高度＝压力/（），所以和容器的横截面积没有关系。
【单选题】在依法必须进行招标的工程范围内,对于重要设备、材料等货物的采购,其单项合同 估算价在( )万元以上的,必须进行招标。
A.
50
B.
100
C.
150
D.
200
【单选题】Which of the following is true regarding the similarities and differences in monopolistic competition and monopoly?
A.
The monopolist faces a downward-sloping demand curve while the monopolistic competitor faces an elastic demand curve.
B.
The monopolist charges a price above marginal cost while the monopolistic competitor charges a price equal to marginal cost.
C.
The monopolist makes economic profits in the long run while the monopolistic competitor makes zero economic profits in the long run.
D.
Both the monopolist and the monopolistic competitor operate at the efficient scale.
【简答题】垄断竞争(monopolistic competition)
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