( )是一家企业在竞争中比其他企业拥有更具有优势的关键资源或活动,它具有竞争对手难以模仿,不可移植,也不会随员工的离开而流失等特点。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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