测定汞多用冷原子吸收光谱法,将消化好的样品中Hg2+→HgO所使用的还原剂是什么()。
A.高锰酸钾
B.碘化钾
C.氯化亚锡
D.硫酸+锌
E.氯酸钾
参考答案:C
—What do you think of the play?
—_______. There are many interesting characters in it.
A.It is a musical play
B.It’s wonderful
C.It is a famous writer’s work
D.It is about a musician’s story
各级应当为政治教员学习、备课提供必要的()和()。