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【单选题】
眼结膜发绀是由于A.
血管运动中枢机能紊乱及外周血管扩张的结果
B.
循环血液量不足以致局部血液供血不足所造成的
C.
胆色素代谢障碍，使血中胆红素浓度增高所致
D.
血的氧饱和度不足或出现多量的异常血红蛋白衍生物
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