裂腹畸形的正确描述是()①胎儿真性腹壁缺损,从脐部裂开,内脏通过裂孔脱出②脱出内容物既无疝囊,又无皮肤覆盖③脱出物外包裹一透明膜④胎儿横膈有缺损
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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