【简答题】(14分)研究NO 2 、SO 2 、CO等大气污染气体的测量及处理具有重要意义。 (1)I 2 O 5 可使H 2 S、CO、HC1等氧化,常用于定量测定CO的含量。已知: 2I 2 (s) + 5O 2 (g)= 2I 2 O 5 (s) △ H =-75.56 kJ·mol - 1 2CO(g) + O 2 (g)= 2CO 2 (g) △ H =-566.0 kJ·mol - 1...
【简答题】阅读理解。 Have you ever spoken or acted before the public? Have you got stage fright c怯场)? Many people have such an experience but they feel differently about it. Some are just a little nervous, others ...
【判断题】在总账系统中,取消出纳凭证的签字既可有出纳员自己进行,也可以由会计主管进行
【判断题】主键约束中的字段不能接受空值, UNIQUE 约束的字段也不能接受空值。
【单选题】If you have herd mentality, it means that you_____________
A.
do something out of your free will
B.
do something because your peers do it
C.
are forced to do something you don't like
D.
hate to do what you have to do
【判断题】在总账系统中,取消出纳凭证的签字既可有出纳员自己进行,也可以由会计主管进行 ( F )
【单选题】词义替换。 —What do you often do in your spare time ? —Play basketball.
【单选题】---Remember the first time we____ , Ed ? ---Of course, I do. You _____ a song on the stage.
【多选题】大气中的NO和NO2常用的测定方法有()