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【多选题】
关于IS曲线的特征描述,正确的答案有A.
IS曲线反映了产品市场均衡时收入与利率之间存在反方向变化关系
B.
通常，IS曲线的斜率为负
C.
IS曲线上任意点I=S
D.
IS曲线的斜率取决于投资对利率变化的敏感程度
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【单选题】The figure given above depicts the IS-LM-FE model with floating exchange rates. In Figure 24.1, the shift of the FE curve from FE0 to FE1 was caused by:
A.
acontractionary monetary policy.
B.
official intervention in the foreign exchange market.
C.
an improvement in current account position.
D.
an appreciation of the country's currency.
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【多选题】有关灰色预测的说法正确的有（）。
A.
是一种对含有不确定因素的系统进行预测的方法
B.
建立模型之前，需先对原始时间序列进行数据处理
C.
常用的数据处理方式有累加和累减两种
D.
建立模型之前，不需先对原始时间序列进行数据处理
E.
经过数据处理后的时间序列称为生成列
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【多选题】有关灰色预测的说法正确的是()
A.
是一种对含有不确定因素的系统进行预测的方法
B.
建立模型之前，需先对原始时间序列进行数据处理
C.
常用的数据处理方式有累加和累减两种
D.
建立模型之前，不需先对原始时间序列进行数据处理
E.
经过数据处理后的时间序列称为生成列
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