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【单选题】
一个企业生产20单位产品,平均总成本是25元,边际成本是15元。如果将产量增加到21单位,以下哪种情况一定会发生?A.
边际成本会减少
B.
边际成本会增加
C.
平均总成本会减少
D.
平均总成本会增加
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反馈参考答案：
举一反三
【单选题】In orde to make the hired childre do their best the college students at one time .
A.
gave them a sound beating
B.
offered them competitive bonuses
C.
promised to pay them in advance
D.
threatened them
【单选题】Do you know nearly ________of our body is water?
A.
three-quarter
B.
three quarters
C.
three fourth
D.
three fourths
【简答题】The family man? Father was a hardworking man who tried his best to support his wife and three children. He spent all his evenings attending classes, hoping to improve himself so that he could one day ...
【单选题】What does the author think teachers do which they should not do? ______
A.
They give children correct answers.
B.
They point out children's mistakes to them.
C.
They allow children to mark their own work.
D.
They encourage children to copy from one another.
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