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【单选题】
以下关于动脉血压的描述,错误的是A.
在安静状态下，我国健康老年人的收缩压为100~120mmHg，舒张压为60~80mmHg。
B.
脉压是指收缩压和舒张压的差值。
C.
平均动脉压并非收缩压和舒张压的平均值。
D.
在临床工作中，通常将上臂测得的肱动脉血压代表动脉血压。
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