数据库管理系统DBMS中用来定义模式、内模式和外模式的语言为 ( )A.C B. 发布时间:2017-06-21 13:36 │ 来源:www.tikuol.com 题型:单项选择题 问题: 数据库管理系统DBMS中用来定义模式、内模式和外模式的语言为 ( )A.CB.BasicC.DDLD.DML
题型:单项选择题 阅读短文,从方框中选择合适的词语,并用其适当形式补全短文。but, take place, in the past, go to work, used to be Over the past ten years, great changes (1)________ in our hometown. (2)________, the houses in our hometown were very old, (3)________ now most of the people have moved into tall buildings. The water in the river (4)________ very dirty, but now the river is very clean, and we can swim in it. People here used to walk or ride bikes, but now they can take buses or drive their own cars (5)________. 查看答案
题型:单项选择题 The 3G cell-phone must be of great use to ______ wants to get the information through the Internet quickly.A.whoB.whoeverC.whomeverD.whichever 查看答案
题型:单项选择题 下列哪些是缩窄性心包炎的CT表现().A.心包不规则增厚,为5~20mmB.心包增厚呈弥漫性或局限性C.心包钙化D.上下腔静脉扩张E.增强扫描可见扩张的左、右心房,左、右心室呈管状 查看答案