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【单选题】
人感染H7N9禽流感病例出院标准：体温正常，临床症状基本消失，呼吸道标本人感染H7N9禽流感病毒核酸检测连续（）次阴性，可以出院A.
1
B.
2
C.
3
D.
4
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【单选题】A basic characteristic of the firms in an oligopoly market structure is that they are:
A.
large (relative to the total market) and interdependent.
B.
large (relative to the total market) and independent.
C.
small (relative to the total market) and interdependent.
D.
small (relative to the total market) and independent.
【单选题】Failure by market structure is caused by:
A.
positive spillover effects.
B.
positive externalities.
C.
negative externalities.
D.
none of these.
【单选题】Market structure is not typically characterized on the basis of:
A.
the number and size distribution of active buyers and sellers.
B.
potential entrants.
C.
exit barriers.
D.
government regulation.
【单选题】Funny animals is a term used in comics and animated cartoons __________ the animals are given human characteristics.
A.
where
B.
that
C.
why
D.
as
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