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【单选题】
A 65-year-old slightly cyanotic man presents to his physician complaining of ruritus and nose bleeds. A blood test reveals a hematocrit of 62%, leading to the diagnosis of polycythemia vera. Treatment includes aspirin to prevent thrombosis and periodic phlebotomy to reduce the hematocrit. The reduction in hematocrit is beneficial because it does which of the following?A.
Reduces blood velocity
B.
Decreases cardiac output
C.
Reduces blood viscosity
D.
Increases arterial oxygen saturation
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皮皮学刷刷变学霸
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【简答题】曹冲称象主要反映出的是（ ）
【简答题】侗语属____。
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