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单选题 The heart rate of a healthy adult in quiet environment is about

A. 60~100 times/min(60~100次/分)

B. 80~150 times/min(80~150 次/分)

C. 50~80 times/min(50~80次/分)

学科：默认课程

时间：2026-03-23 02:45:39

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