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【多选题】
下面有关需求价格弹性的说法中正确的是( )A.
在需求富有弹性时，企业为了增加销售收入，应该降价销售
B.
在需求缺乏弹性时，企业为了增加销售收入，应该降价销售
C.
线性需求曲线上每一点的弹性总是一样的
D.
完全竞争厂商面临的需求曲线弹性为无穷大
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