【单选题】物质的分子体系中存在着电子能级、振动能级和转动能级,在室温时,大多数分子处在(),当受到一定的辐射能的作用时,就会发生能级之间的跃迁。
【判断题】CCTV电视新闻史上第一次出现基于大数据而生成的可视化人形图像是2014年央视“据说两会”系列报道中出现的“数据哥”形象。
【简答题】They quarreled themselves red in the face.
【单选题】The old couple have been married for 40 years and never once ________ with each other.
【单选题】They loved each other. They quarreled (争吵) from time to time.
A.
They loved each other, even though they quarreled (争吵) from time to time.
B.
Even if they loved each other, they quarreled (争吵) from time to time.
【多选题】药典溶液后标记的“1→10”符号系指
E.
固体溶质1.0g加水(未指明何种溶剂时)10ml的溶液
【判断题】药典溶液后标记的“1→10”符号系指固体溶质1.0g加溶剂10ml的溶液或液体溶质1.0ml加溶剂10ml的溶液
【判断题】CCTV 电视新闻史上第一次出现基于大数据而生成的可视化人形图像是 2014 年央视“据说两会”系列报道中出现的“数据哥”形象。
【单选题】对于表A(col1 int,col2 char(1))使用聚合函数sum,下面语句正确的是( )
A.
select sum(col2) as col2 from A group by col1
B.
select sum(col1) as col1 from A group by col2
C.
select sum(col1) as col1,col2 from A group by col1
D.
select sum(col2) as col1 from A group by col2