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【单选题】
当生产要素增加10％时，产量的增加小于10％的情况是( )A.
边际成本递减
B.
长期平均成本曲线向右下方倾斜
C.
存在规模收益递增
D.
存在规模收益递减
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举一反三
【单选题】Dick is the only one of the teachers who ____ Chinese. He is one of Mary’s friends who _____ been to China.
A.
know; have
B.
knows; have
C.
know; has
D.
knows; has
【单选题】Jeremy Shu-How Lin, NBA star, is one of _____ few basketball players who are very popular to Chinese fans. [ ]
A.
an; the
B.
the; a
C.
a; the
D.
an; a
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