AB两家企业都从事同一种保健品的经营,原来各自在汕头和潮州销售,相安无事。但是最近A企业为了扩大销售,也到潮州销售自己的产品。这是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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