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【单选题】
SPWM控制方式就是对逆变电路开关器件的通断进行控制，使输出端得到一系列（ ）脉冲，用来代替正弦波。A.
等幅不等宽
B.
等幅等宽
C.
不等幅不等宽
D.
不等幅等宽
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举一反三
【单选题】When a monopolist is able to sell its product at different prices to different customers, it is likely engaging in:
A.
quality-adjusted pricing.
B.
price discrimination.
C.
price differentiation.
D.
illegal activities.
【简答题】在单排行星齿轮机构中,如约束太阳轮,齿圈为主动元件,行星架为从动元件,那么两者旋转方向( )。
【单选题】Graphically, the marginal revenue curve of a monopolist:
A.
lies below the demand curve of a monopolist.
B.
is the same as the demand curve of a monopolist.
C.
lies above the demand curve of a monopolist.
D.
is the same as the marginal cost curve of a monopolist.
【单选题】An increase in a monopolist’s average cost will lead to
A.
an increase in price, as the monopolist passes on the price increase
B.
an increase in price only if marginal cost also increases
C.
a decrease in price as the monopolist needs to sell more in order to cover increased costs
D.
an increase in price only if the elasticity of demand is less than 1.0
【单选题】Following excercise (2), check the incentive compatibility condition for the H quality monopolist. Which of the following statement is TRUE?
A.
It is possible for the H quality monopolist to signal his quality with advertising spending, because he can be compensated by the high profit in the 2nd period, while L quality firm cannot.
B.
It is possible for the H quality monopolist to signal his quality with advertising spending, because he can gain a higher profit than he would have gained if he were seens as a L quality firm.
C.
It is not possible for the H quality monopolist to signal his quality with advertising spending, because the sacrefice is too large to be compensated by the 2nd period profit.
D.
It is not possible for the H quality monopolist to signal his quality with advertising spending, because his profit is too low compared to the perfect information case.
【单选题】A monopolist that chooses price
A.
necessarily produces less than a monopolist that chooses quantity, hence the laws against price fixing.
B.
operates according to the Harvard tradition rather than the Chicago tradition.
C.
produces more than a monopolist that chooses quantity, thus the irony of laws against price fixing.
D.
produces the same amount as a monopolist that chooses quantity.
【单选题】Which of the following best explains why marginal revenue for a monopolist is less than the sales price?
A.
To sell more units, the monopolist must reduce price on all units sold.
B.
As the monopolist expands output, the average total cost of production declines.
C.
The monopolist charges each consumer the highest possible price.
D.
When a firm has a monopoly, consumers have no choice other than to pay the price set by the monopolist.
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