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【简答题】
下面的装置是仿照工业上制备硫酸的工艺流程设计出来的，用于探究工业上为何采用98.3%的浓硫酸吸收三氧化硫。 请回答下列问题： (1)写出沸腾炉内煅烧黄铁矿的反应方程式__________________； (2)甲和乙相当于工业上制取硫酸装置中的_______________； (3)写出在催化剂表面所发生反应的化学方程式_______________，在实验过程中不能持续加热的理由是 ___________； (4)在乙反应器内要求氧气的量要比二氧化硫的量多一倍左右，你是如何控制和估计的？___________。 (5)若丁装置在反应过程中先出现气泡，不久就出现了雾，而丙装置一直都没有任何现象，产生这种现象的原因可能是__________ A．浓硫酸对三氧化硫的吸收效率远好于水，三氧化硫被浓硫酸充分吸收 B．三氧化硫的通气速率太快，三氧化硫未被浓硫酸充分吸收 C．丙中的导气管插得太深，导致两个吸收瓶内的气压差较大 D．丁中的导气管插得太浅，三氧化硫气体从水中逸出，与水蒸气化合形成酸雾
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参考答案：
举一反三
【单选题】根据导线共管敷设原则,下列各线路中不得共管敷设的是( )。
A.
有联锁关系的电力及控制回路
B.
用电设备的信号和控制回路
C.
同一照明方式的不同支线
D.
事故照明线路
查看完整题目与答案
【单选题】The boys when the teacher came in. So she was very angry．
A.
were doing homework
B.
were cleaning the classroom
C.
were fighting
D.
were learning English
查看完整题目与答案
【判断题】切削时的切削热大部分由工件传散出去。( )
A.
正确
B.
错误
查看完整题目与答案
【简答题】对外贸易值和对外贸易量是如何计算的?根据联合国的统计,1970年资本主义国家的出口值为2800亿美元,1978年为11736亿美元;而以1970年的出口价格指数为100,则1978年是265。请问在1970-1978年期间,实际贸易规模增长了多少?
查看完整题目与答案
【单选题】(Para. 4) The cooking, the cleaning and the childcare were all amazing bonuses that I don’t dare complain about...
A.
The cooking, the cleaning and the childcare were an unexpected huge help that I cannot think of complaining about...
B.
The cooking, the cleaning and the childcare were done amazingly so I had no reason to complain about my husband…
查看完整题目与答案
【单选题】钻削时的切削热大部分由( B )传散出去 钻削时的切削热大部分由( B )传散出去 钻削时的切削热大部分由( )传散出去
A.
刀具
B.
工件
C.
切屑
D.
空气
查看完整题目与答案
【简答题】医院本年的结余=( )+( )+投资净收益
查看完整题目与答案
【单选题】The cooking, the cleaning and the childcare were all amazing bonuses that I don’t dare complain about... (Para. 4)(选择同义句)
A.
The cooking, the cleaning and the childcare were done amazingly so I had no reason to complain about my husband.
B.
The cooking, the cleaning and the childcare were an unexpected huge help that I cannot think of complaining about...
查看完整题目与答案
【单选题】As a way of ______ the mails while they were away, the Johnsons asked the cleaning lady to send little printed slips asking the senders to write again later.
A.
picking up
B.
coping with
C.
passing out
D.
getting across
查看完整题目与答案
【单选题】The cooking, the cleaning and the childcare were all amazing bonuses that I don't dare complain about...
A.
The cooking, the cleaning and the childcare were done amazingly so I had no reason to complain about my husband...
B.
The cooking, the cleaning and the childcare were an unexpected huge help that I cannot think of complaining about...
查看完整题目与答案
相关题目：
【单选题】根据导线共管敷设原则,下列各线路中不得共管敷设的是( )。
A.
有联锁关系的电力及控制回路
B.
用电设备的信号和控制回路
C.
同一照明方式的不同支线
D.
事故照明线路
查看完整题目与答案
【单选题】The boys when the teacher came in. So she was very angry．
A.
were doing homework
B.
were cleaning the classroom
C.
were fighting
D.
were learning English
查看完整题目与答案
【判断题】切削时的切削热大部分由工件传散出去。( )
A.
正确
B.
错误
查看完整题目与答案
【简答题】对外贸易值和对外贸易量是如何计算的?根据联合国的统计,1970年资本主义国家的出口值为2800亿美元,1978年为11736亿美元;而以1970年的出口价格指数为100,则1978年是265。请问在1970-1978年期间,实际贸易规模增长了多少?
查看完整题目与答案
【单选题】(Para. 4) The cooking, the cleaning and the childcare were all amazing bonuses that I don’t dare complain about...
A.
The cooking, the cleaning and the childcare were an unexpected huge help that I cannot think of complaining about...
B.
The cooking, the cleaning and the childcare were done amazingly so I had no reason to complain about my husband…
查看完整题目与答案
【单选题】钻削时的切削热大部分由( B )传散出去 钻削时的切削热大部分由( B )传散出去 钻削时的切削热大部分由( )传散出去
A.
刀具
B.
工件
C.
切屑
D.
空气
查看完整题目与答案
【简答题】医院本年的结余=( )+( )+投资净收益
查看完整题目与答案
【单选题】The cooking, the cleaning and the childcare were all amazing bonuses that I don’t dare complain about... (Para. 4)(选择同义句)
A.
The cooking, the cleaning and the childcare were done amazingly so I had no reason to complain about my husband.
B.
The cooking, the cleaning and the childcare were an unexpected huge help that I cannot think of complaining about...
查看完整题目与答案
【单选题】As a way of ______ the mails while they were away, the Johnsons asked the cleaning lady to send little printed slips asking the senders to write again later.
A.
picking up
B.
coping with
C.
passing out
D.
getting across
查看完整题目与答案
【单选题】The cooking, the cleaning and the childcare were all amazing bonuses that I don't dare complain about...
A.
The cooking, the cleaning and the childcare were done amazingly so I had no reason to complain about my husband...
B.
The cooking, the cleaning and the childcare were an unexpected huge help that I cannot think of complaining about...
查看完整题目与答案
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