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【判断题】
0103 若数列 收敛,则 与 都收敛 .A.
正确
B.
错误
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【单选题】Consider Figure 5.3. Assume that Swedish import companies behave as competitive buyers while foreign export companies behave as a monopoly seller. Compared to free trade, Sweden's import quota results...
A.
Gains totaling $3.20
B.
Gains totaling $4.80
C.
Losses totaling $3.20
D.
Losses totaling $4.80
【单选题】Monopoly results in a welfare loss because:
A.
marginal revenue does not equal marginal cost.
B.
the monopolist restricts output below the socially efficient level.
C.
average variable cost is not minimized.
D.
total cost is not minimized.
【简答题】1)改变励磁电流时,同步电动机的定子电流发生什么变化?对电网有什么影响?
【单选题】患儿,女,5岁。突然发生惊厥,全身肌肉强直性痉挛,眼球上翻,抠图包膜,牙关紧闭,呼吸不规则,发绀,大小便失禁,惊厥发作持续30分钟以上。最可能的诊断是
A.
热性惊厥
B.
癫痫小发作
C.
惊厥持续状态
D.
中毒性脑病
E.
婴儿手足搐搦症
【简答题】气体在喷管中作稳定可逆绝热流动时，为什么气体速度增加时，必伴有压力下降？
【单选题】患儿,女,5岁。突然发生惊厥,全身肌肉强直性痉挛,眼球上翻,,牙关紧闭,呼吸不规则,发绀,大小便失禁,惊厥发作持续30分钟以上。最可能的诊断是
A.
热性惊厥
B.
癫痫小发作
C.
惊厥持续状态
D.
中毒性脑病
E.
婴儿手足搐搦症
【单选题】In a monopolistically competitive industry, the competitive element results from ____ and the monopoly element results from ____.
A.
product differentiation; substantial barriers to entry.
B.
a large number of firms and free entry; product differentiation.
C.
advertising; product differentiation.
D.
product differentiation; the small number of large producers.
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