【多选题】标定 KMnO 4 溶液的基准物质有( )
【单选题】标定KMnO 4 溶液最常用的基准物质有( )。
【单选题】标定KMnO4标准溶液时,常用的基准物质有( )
【多选题】可用来标定KMnO 4 溶液的基准物质有()。
D.
NH 4 Fe(SO 4 ) 2 •12H 2 O
【单选题】I am extremely ______ at the way he always stares at me in the office.
【单选题】I am sorry, I am very sorry and I am extremely sorry.
A.
This sentence contains irony
B.
This sentence contains pun
C.
This sentence contains simile
D.
This sentence contains climax
【简答题】I am extremely grateful all the teachers their help.
【判断题】信息量大既是计算机网络教育资源的优点,也是其缺点
【判断题】用作标定 KMnO4溶液浓度的基准物质有:草酸、草酸钠。()