【单选题】国际电工标准委员会(IEC)规定了直流安全电压的上限值为()V。
【多选题】人生实践中,人们往往会遇到各种矛盾和挫折,这就需要端正人生态度。下列选项中,不正确的人生态度是( )。
【单选题】国际电工委员会(IEC)标准规定,工频安全电压的限定值也为()V。
【简答题】国际电工委员会(IEC)规定安全电压限定值为( )V。
【单选题】Which of the following accurately describes a major difference between a monopolist and firms in perfectly competitive markets?
A.
The monopolist maximizes profit; firms in perfectly competitive markets maximize sales.
B.
The monopolist may earn long-run economic profit; firms in perfectly competitive markets cannot.
C.
The monopolist is a price taker; firms in other markets are price searchers.
D.
The monopolist may earn short-run profit; firms in perfectly competitive markets cannot.
【单选题】国际电工委员会(IEC)规定安全电压限定值为()伏?
【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.