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【单选题】
关于慢性肾衰竭时的血液系统的表现,下列哪错误的A.
贫血是必有的症状
B.
红细胞生成素减少
C.
贫血容易纠正，输新鲜血可使血红蛋白恢复正常
D.
白细胞趋化、吞噬和杀菌能力减弱
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A.
they have entered the workforce at a much earlier age
B.
they are pessimistic about their economic future
C.
they have embraced a business culture of stability
D.
they are driven by an overwhelming sense of individualism
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