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夜班护士通过心电监护发现2床病人呼吸、心率、血压有大幅度波动，眼球迅速转动，请评估该病人处于以下睡眠周期中的 A.
REM期 B.
NREM第一期 C.
NREM第二期 D.
NREM第三期 E.
NREM第四期

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