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【单选题】
Which of the following is true for a monopolist but not for a perfectly competitive firm?A.
Marginal revenue is less than price.
B.
Economic profits could be earned in the long run.
C.
Profit maximization occurs at the output level where marginal revenue equals marginal cost.
D.
(a) and (b) are true for a monopolist but not for a perfectly competitive firm.
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举一反三
【单选题】What a wonderful time we are having. It is a bestholiday I ______ before.
A.
． was having
B.
． have
C.
． have ever had
D.
． had ever had
【单选题】______ we are having these days!
A.
What a lovely weather
B.
What lovely weathers
C.
What lovely weather
D.
What lovely a weather
【多选题】下列有关消防管道工程常用连接方式的说法，正确的有（ ）。
A.
采用螺纹连接时，热浸镀锌钢管的管件宜采用锻制承插焊和螺纹管件
B.
宜采用密封胶带作为螺纹接口的密封，密封带应在外螺纹上施加
C.
法兰连接是管道工程中最重要且应用最广泛的连接方式
D.
法兰连接按法兰与管子的固定方式分为螺纹法兰、焊接法兰、松套法兰等
E.
消防上多用到铸铁管的承插连接，铸铁管的承插连接方式分为机械式接口和非机械式接口
【简答题】简述物流企业绩效评价的基本原则
【单选题】—_____ class are you having?—We are having an English class.
A.
Which
B.
What
C.
When
【单选题】— Where shall we go this weekend? — ________ .
A.
What is having a drive to the country
B.
How is to take a drive to the country
C.
What about having a drive to the country
D.
We’re having a drive to the county
【单选题】----“What a terrible rain we are having!” ----“Yes. We are asked to pay more attention to the information about the rain ______ flood.”
A.
as well as
B.
so long as
C.
because of
D.
in case of
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