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【单选题】
Which of the following best explains why a monopolist's marginal revenue is less than the sale price?A.
To sell more units, a monopolist must increase the price on all units sold.
B.
As a monopolist expands output, its average total cost declines.
C.
When a firm has a monopoly, consumers have no choice other than to pay the price set by the monopolist.
D.
When a monopolist reduces price in order to sell more units, it must lower the price of some units that could otherwise have been sold at a higher price.
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【单选题】适合于应用传递函数描述的系统（ ）
A.
只能是单输入，单输出的定常系统；
B.
可以是单输入，单输出的时变系统；
C.
可以是非线性系统；
D.
只能是单输入，单输出的线性定常系统。