题目：
心率是指 。成年人在安静状态下的正常心率约为 。儿童的心率一般 （低于；高于；等于）成年人。
答案：
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答案：A
心率是指 。成年人在安静状态下的正常心率约为 。儿童的心率一般 （低于；高于；等
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