【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( )
【简答题】用作标定 KMnO 4 溶液浓度的基准物质有: 、 、 等,其中以 最常用。因为它不含结晶水,不吸水、易精制和保存。
【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】用作标定 KMnO4溶液浓度的基准物质有:草酸、草酸钠。()
【单选题】I am extremely grateful ( ) the help you provided for me.