【单选题】【消耗次数：1】
老年人大动脉硬化时，常引起（ ）
①
收缩压升高明显，脉压减小
②
收缩压升高明显，脉压增大
③
收缩压降低明显，脉压减小
④
舒张压升高明显，脉压减小
参考答案：
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若收缩压≥（ ）毫米汞柱及舒张压<（ ）毫米汞柱，则定义为老年单纯性收缩期高血压
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