[问答题] 便携式无线电台的用途有哪些？

氧化剂的特性是什么？ 膈下脓肿位于：①左上腹②上腹部后方③膈肌下面 ["②","③","①","②③"] 下图病例最可能的诊断 ["主动脉二叶瓣","主动脉单瓣","主动脉四叶瓣","主动脉三叶瓣","主动脉五叶瓣"] 大小网膜囊描述正确的是 ["大网膜囊在胰腺的前下方","大网膜囊在胰腺的后下方","小网膜囊在胰腺的前下方","小网膜囊在胰腺的前上方"] 我国目前使用哪些火警调度机？ 便携式无线电台的用途有哪些？