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【简答题】
已知某人月收入为1200元，全部花费在X和Y两种商品上，他的效用函数为U=XY，X商品的价格为20 元，Y商品的价格为30元。根据以上资料，回答下列问题：为使总效用最大，他购买的X和Y的数量各为()。 A.20、20 B.20、30 C.30、20 D.30、30 当总效用取得最大时，他获得的总效用为()。A.400 B.600 C.900 D.1200 假设X商品的价格提高44%，Y商品的价格不变，为保持原有的最大效用水平，该消费者的收入必须增加( )元。 A.20 B.40 C.60 D.100
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【简答题】C It was already late when we set out for the next town. It was about 15 miles away on the other side of the hills. There we felt sure that we would find a village, but unluckily we met no one as we d...
【简答题】After a banner day out with Polly, I drove her to a big old oak tree on a hill off the highway, where we could enjoy a perfect view of the .
【简答题】答案请用小写字母a,b,c,d填空 It was already late when we set out for the next town, 1 according to the map was about fif miles away on the other side of the 2 . There we felt 3 that we would find a bed 4 the...
【单选题】“老年人口负担系数”指一定区域内的老年人口数量与劳动年龄人口（15-64岁）数量之比，下图为2010年我国老年人口负担系数空间分布图，该图反映出
A.
东部省区和中部省区的养老负担均大于西部省区
B.
中部地区的老年人口数量最多
C.
人口负担系数大的省区，主要是因为人口自然增长快
D.
广东省老年人口负担系数小，与人口的迁入有关
【简答题】老年人口负担系数是指？
【简答题】After a day out with Polly, I drove her to a big old oak tree on a hill off the highway, where we could enjoy a perfect view of the . Then I was ready to talk with Polly about logic, the first thing u...
【简答题】人口负担系数也称抚养系数。是指人口总体中非劳动年龄人口数与劳动年龄人口数之比，用百分比表示。(人口负担系数=(14岁及以下人口数+65岁及以上人口数)/(15～岁人口数)×100%)读“我国人口负担系数变化图”(下图)，回答下列问题。 小题1:在A、B、C、D四阶段 A．A阶段我国人口老龄化严重 B．B阶段人口负担下降主要是因为我国的经济水平大幅度提高 C．C阶段初期给我国劳动密集型工业发展提...
【单选题】We drove out of the town by the same road ____ we had entered by.
A.
where
B.
which
C.
as
D.
that
【简答题】It was already late when we set out for the next town, according to the map was about fif miles away on the other side of the . There we felt that we would find a bed the night. Darkness fell soon...
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