整个电磁波谱包括()
A.红外线
B.X射线
C.紫外线
D.无线电波
E.可见光
参考答案:A, B, C, D, E
(2014·河北教学质量检测)Many people tried to leave the country,________there was much violence and a serious shortage of food supply.
A.where
B.which
C.that
D.what
不能使蛋白质变性的物质是( )
A.甲醛
B.氯化钠
C.浓硝酸
D.硫酸铜