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北京最古老、最著名的繁华街市是( )。
造成雷达目标图像左右扩大的主要因素是()。
下列设备中,具有自吸能力的是()。
为了防止碰撞的发生,射频识别系统中需要设计相应的防碰撞技术,在通信中这种技术也称为多址技术,多址技术主要分为以下四种:()、()、()、()多址。
具有润泽保护、解毒收敛、止痒生肌作用的外用剂型是:()
政协全国委员会全体会议行使的职权有( )
神舟九号和天宫一号完成了载人交会对接,是我国载人航天历史上的又一次伟大胜利。下列关于人类探索太空的说法,错误的是( )。
分析流行病学中,研究者可以控制选择偏倚是在()。
环境保护监督管理体制中的“统管”部门与“分管”部门之间是行政上的隶属关系,因而存在领导与被领导、监督与被监督的关系。
炎症时白细胞定向移动的主要原因是( )
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