通常发绀是指血中还原血红蛋白A.>5g/dl B.>10g/dl C.>4g

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问题 通常发绀是指血中还原血红蛋白A.>5g/dlB.>10g/dlC.>4g/dlD.>7g/dlE.>2g/dl

选项 A.>5g/dl
B.>10g/dl
C.>4g/dl
D.>7g/dl
E.>2g/dl

答案 A

解析
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