患儿女,10个月,1天前出现发热、T38.8℃,犬吠样咳嗽、声音嘶哑、烦躁不安、安静时有吸气性喉鸣和三凹征,听诊双肺可闻及喉传导音或管状呼吸音,心率加快,此患儿被诊断为急性感染性喉炎,其喉梗阻程度为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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