某制药公司的泡罩软包装用的是铝箔(PTP)—聚氯乙烯(PVC)硬片。对吸湿性极强的中药制剂并不是优良的包装,问题在于()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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