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【单选题】
文件系统中最小的数据存取单位是( )A.
数据项
B.
记录
C.
D.
文件
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【简答题】Willam Shakespeare was a writer of plays and poems. Some of his most famous plays are Hamlet, Romeo and Juliet, Macbeth .He wrote thirty-seven plays in all. They are still popular today. He was born i...
【单选题】In his plays Shakespeare _____ his characters live through their language. D
A.
would make
B.
had made
C.
made
D.
makes
【简答题】溶液中pH值对 CrO 4 2- 和 Cr 2 O 7 2- 存在平衡有何影响?
【单选题】实验室中常用的铬酸洗液是由哪两种物质配制的( )
A.
K2CrO4和浓 H2SO4
B.
K2CrO4和浓 HCl
C.
K2Cr2O7和浓 HCl
D.
K2CrO4和浓 H2SO4
【简答题】利用Cr 2 O 7 2－ +H 2 O⇋2CrO 4 2－ +2H + 的K＝10 14 和Ag 2 CrO 4 的溶度积以及Ag + +e － ⇋Ag标准电极电势求2Ag 2 CrO 4 +2H + +4e － ⇋4Ag+Cr 2 O 7 2－ +H 2 O的标准电极电势。
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