根据下列条件,回答{TSE}题:张先生,70岁,因心力衰竭住院已3周,体质虚弱,近日骶尾部皮肤破溃,经护士仔细观察后认为是压疮炎性浸润期{TS}支持其判断的典型表现是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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