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【单选题】
巴比妥类药物在pH13和pH10溶液在那个，紫外最大吸收均为240nm的药物是（）。
A.
苯巴比妥
B.
硫喷妥钠
C.
己锁巴比妥
D.
巴比妥
E.
巴比妥酸
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参考答案：
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【简答题】为了回收利用SO 2 ，研究人员研制了利用低品位软锰矿浆（主要成分是MnO 2 ）吸收高温焙烧含硫废渣产生的SO 2 废气，制备硫酸锰晶体的生产流程，其流程示意图如下： 已知，浸出液的pH<2，其中的金属离子主要是Mn 2+ ，还含有少量的Fe 2+ 、Al 3+ 等其他金属离子。有关金属离子形成氢氧化物沉淀时的pH见下表 请回答下列问题： (1)写出浸出过程中主要反应的化学方程式：_______...
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【简答题】Why are labor-at-the-keyboard sites gaining popularity? A) Because people love to work on the Internet. B) Because more people are finding jobs on the Internet. C) Because people are being asked to wo...
查看完整题目与答案
【单选题】Why was the man's wife cheering?
A.
Because she was excited by the game.
B.
Because her team won the game.
C.
Because the game would come to an end very soon.
查看完整题目与答案
【单选题】Communication is important because it can help people to ______.
A.
understand the world and other people better
B.
teach each other to speak, write, read and draw
C.
know what other people are thinking about
D.
learn what's happening in the world more quickly
查看完整题目与答案
【单选题】下列离子方程式中正确的是
A.
在酸性硫酸亚铁溶液中加入过氧化氢：Fe 2 ＋ ＋H 2 O 2 ＋2H ＋ ＝Fe 3 ＋ ＋2H 2 O
B.
AgNO 3 溶液中加入过量的氨水：Ag ＋ ＋NH 3 ·H 2 O＝AgOH↓＋NH 4 ＋
C.
在含有Mn 2 ＋ 的溶液中加入HNO 3 ，再加入PbO 2 ，则反应体系显紫红色： 5PbO 2 ＋2Mn 2 ＋ ＋4H ＋ ＝5Pb 2 ＋ ＋2MnO 4 － ＋2HO
D.
将数滴0.1 mol/L 盐酸溶液缓缓滴入1 mol/L 50mL Na 2 CO 3 溶液中，且不断搅拌： 2H ＋ ＋CO 3 2 － ＝CO 2 ↑＋H 2 O
查看完整题目与答案
【单选题】Why was silk liked by people?
A.
Because it was strong.
B.
Because it was cheap.
C.
Because it was expensive and only nobles could wear clothes made by silk.
D.
Because it was like iron.
查看完整题目与答案
【简答题】A．Because man has a strong desire for a modern way of life. B．Because people pay no attention to it. C．Because people from the countryside rush into the cities. D．Because people are not aware of the b...
查看完整题目与答案
【简答题】2019年上半年学生自我诊改情况统计。(请将WORD文件以上传附件的形式作答)
查看完整题目与答案
【简答题】为了回收利用SO 2 ，研究人员研制了利用低品位软锰矿浆（主要成分是MnO 2 ）吸收高温焙烧含硫废渣产生的SO 2 废气，制备硫酸锰晶体的生产流程，其流程示意图如下： 已知，浸出液的pH＜2，其中的金属离子主要是Mn 2+ ，还含有少量的Fe 2+ 、Al 3+ 等其他金属离子．有关金属离子形成氢氧化物沉淀时的pH见下表： 离子 开始沉淀时的pH 完全沉淀时的pH 加碱溶解的pH Fe 2+ 7...
查看完整题目与答案
【单选题】听力原文：M：Could you describe the two people who robbed the bank? W：Well，the man was tall with dark hair and he was wearing a black sweater．The main thing that I re membered about the woman was that she d...
A.
The man did most of the talking.
B.
The woman was wearing a black sweater.
C.
The man and the woman robbed the bank.
D.
The man and the woman had dark hair.
查看完整题目与答案
相关题目：
【简答题】为了回收利用SO 2 ，研究人员研制了利用低品位软锰矿浆（主要成分是MnO 2 ）吸收高温焙烧含硫废渣产生的SO 2 废气，制备硫酸锰晶体的生产流程，其流程示意图如下： 已知，浸出液的pH<2，其中的金属离子主要是Mn 2+ ，还含有少量的Fe 2+ 、Al 3+ 等其他金属离子。有关金属离子形成氢氧化物沉淀时的pH见下表 请回答下列问题： (1)写出浸出过程中主要反应的化学方程式：_______...
查看完整题目与答案
【简答题】Why are labor-at-the-keyboard sites gaining popularity? A) Because people love to work on the Internet. B) Because more people are finding jobs on the Internet. C) Because people are being asked to wo...
查看完整题目与答案
【单选题】Why was the man's wife cheering?
A.
Because she was excited by the game.
B.
Because her team won the game.
C.
Because the game would come to an end very soon.
查看完整题目与答案
【单选题】Communication is important because it can help people to ______.
A.
understand the world and other people better
B.
teach each other to speak, write, read and draw
C.
know what other people are thinking about
D.
learn what's happening in the world more quickly
查看完整题目与答案
【单选题】下列离子方程式中正确的是
A.
在酸性硫酸亚铁溶液中加入过氧化氢：Fe 2 ＋ ＋H 2 O 2 ＋2H ＋ ＝Fe 3 ＋ ＋2H 2 O
B.
AgNO 3 溶液中加入过量的氨水：Ag ＋ ＋NH 3 ·H 2 O＝AgOH↓＋NH 4 ＋
C.
在含有Mn 2 ＋ 的溶液中加入HNO 3 ，再加入PbO 2 ，则反应体系显紫红色： 5PbO 2 ＋2Mn 2 ＋ ＋4H ＋ ＝5Pb 2 ＋ ＋2MnO 4 － ＋2HO
D.
将数滴0.1 mol/L 盐酸溶液缓缓滴入1 mol/L 50mL Na 2 CO 3 溶液中，且不断搅拌： 2H ＋ ＋CO 3 2 － ＝CO 2 ↑＋H 2 O
查看完整题目与答案
【单选题】Why was silk liked by people?
A.
Because it was strong.
B.
Because it was cheap.
C.
Because it was expensive and only nobles could wear clothes made by silk.
D.
Because it was like iron.
查看完整题目与答案
【简答题】A．Because man has a strong desire for a modern way of life. B．Because people pay no attention to it. C．Because people from the countryside rush into the cities. D．Because people are not aware of the b...
查看完整题目与答案
【简答题】2019年上半年学生自我诊改情况统计。(请将WORD文件以上传附件的形式作答)
查看完整题目与答案
【简答题】为了回收利用SO 2 ，研究人员研制了利用低品位软锰矿浆（主要成分是MnO 2 ）吸收高温焙烧含硫废渣产生的SO 2 废气，制备硫酸锰晶体的生产流程，其流程示意图如下： 已知，浸出液的pH＜2，其中的金属离子主要是Mn 2+ ，还含有少量的Fe 2+ 、Al 3+ 等其他金属离子．有关金属离子形成氢氧化物沉淀时的pH见下表： 离子 开始沉淀时的pH 完全沉淀时的pH 加碱溶解的pH Fe 2+ 7...
查看完整题目与答案
【单选题】听力原文：M：Could you describe the two people who robbed the bank? W：Well，the man was tall with dark hair and he was wearing a black sweater．The main thing that I re membered about the woman was that she d...
A.
The man did most of the talking.
B.
The woman was wearing a black sweater.
C.
The man and the woman robbed the bank.
D.
The man and the woman had dark hair.
查看完整题目与答案
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