【单选题】Are you feeling ___?
【单选题】If you read the book (a second time), (and you) will probably have (quite a different) understanding of the s (described) in lt.
【单选题】If you go by _____ train, you can have quite a comfortable journey,but make sure you get _____ fast one. [ ]
【判断题】由数据对象(包括设计者在实时数据库中定义的数据对象、系统内部数据对象和系统函数)、括号和各种运算符组成的运算式称为表达式,表达式的计算结果称为表达式的值。( )
【单选题】If you read the book a (second time), (and you) will probably have (quite a different) understanding of the s (described) in it.
【简答题】Co(NH3) 4 2+ 为深蓝色,而 Co(NH3) 4 2+ 则为无色,试说明其原因。