医院患者服用安眠药,药物在体内作用5小时后,体内残药量就会以每小时所含药量的速度消失,此患者为了更好地入眠,吃完一片安眠药3小时后又服用了一片,问当体内残药量介于0.43~0.97之间时,至少需要几小时?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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