【简答题】有一双组分可逆反应: A+B P+S 其中B是廉价原料。 已知在某温度T时,平衡常数K=1,c A0 =c B0 =1mol/L,求此温度时的平衡转化率为多少? 为达到x A =0.9,可采取B过量的措施,问物料B的进料浓度至少应该是多少?
【简答题】Tom ________ better than to ask Dick for help. A) shall know B) shouldn’t know C) has known D) should have known
【简答题】某研究性学习小组为证明2Fe 3+ +2I - ?2Fe 2+ +I 2 为可逆反应(即反应存在一定的限度),设计如下几种方案.已知FeF 6 3- 是一种无色的稳定的络离子. 按要求回答下列问题. 方案甲: 取5mL0.1mol/LKI溶液,滴加2ml0.1mol/L的FeCl 3 溶液,再继续加入2mLCCl 4 ,充分振荡.静置、分层,再取上层清液,滴加KSCN溶液. (1)甲方案中能证明该...
【单选题】What does the author mean by saying 'they know better now'?
A.
They know more about the causes of the drought.
B.
They have a better understanding of the drought in Africa.
C.
They have realized that the drought in Europe is the most serious one.
D.
They have realized that droughts hit not only Africa but also Europe.
【单选题】下列关于肝震颤的说法中,错误的是
C.
当检查时,手指压下时,可感到一种微细的震动感,即为肝震颤
D.
此现象产生是由于包囊中的多数子囊浮动撞击囊壁而形成
【单选题】下列关于肝震颤的说法中,错误的是( )
C.
当检査时,手指压下时,可感到一种微细的震动感,即为肝震颤
D.
此现象产生是由于包囊中的多数子囊浮动撞击囊壁而形成
【单选题】writeris better known in China, Charles Dickens or Mark Twain?
【简答题】点B(-1,-1,1)在第______卦限