秦汉文化具有统一性与多样化有机结合、中外文化交流的频繁、水平居世界前列、气势恢宏等突出特点。其中,造成“中外文化交流的频繁”这一特点的直接原因是()。 ["封建专制主义中央集权制度得以确立与巩固","处在封建盛世时期,经济文化高度发达","中外交通发达,政府重视对外交流","科技文化先进,对周边国家有强大的吸引力"]
新文学第一个专门的诗歌刊物是由()主办的《诗》月刊。
三相分离器的工作原理是什么?
恒转矩型电动机的机械特性是() ["拖动转矩是常数","负载转矩是常数","拖动转矩是转速的函数","负载转矩是转速的函数"]
Which two are characteristics of user-managed backup and recovery operations?() ["Recovery is initiated using SQL*Plus.","Database files are backed up using SQL commands.","Database files are backed up with Recovery Manager.","Database files are restored using Recovery Manager.","Database files are backed up using operating system commands."]
城市公共交通管理的原则