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I：某兴趣小组欲在绿色环保的条件下探究大气污染物SO 2 的性质，设计如下图实验装置。请回答： （1）B、C、D分别用于检验SO 2 的漂白性、还原性和氧化性，则B中所盛试剂为_________；C中反应的离子方程式为________________。 （2）为了实现绿色环保的目标，某同学设计了上图A2的制取装置来代替A1装置，与A1装置相比， A2装置的优点是_____________（写2点）。 II：用氨水吸收尾气中的SO 2 ，“吸收液”中可能含有OH - 、SO 3 2- 、SO 4 2- 、HSO 3 - 等阴离子。请回答： （3）氨水吸收过量SO 2 的反应的离子方程式为________________。 （4）已知亚硫酸氢盐一般易溶于水，SO 2 也易溶于水。现有仪器和试剂为：小烧杯、试管、玻璃棒、胶头滴管、过滤装置和滤纸；2 mol/L盐酸、2 mol/LHNO 3 、1 mol/LBaCl 2 溶液、l mol/LBa(OH) 2 溶液、品红溶液、蒸馏水。请设计实验证明“吸收液”中存在SO 3 2- 、HSO 3 - ，完成下表的实验操作、预期现象和结论
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【单选题】It can be inferred from the passage that the author would disapprove of______.
A.
computer science courses in high schools
B.
businessmen and women who use pocket calculators
C.
maintenance(连续不断) checks on computers
D.
companies which depend entirely on computers
【简答题】贾谊《鹏鸟赋》的主要思想内容和艺术特点有哪些
【简答题】网络零售的范围包括( ) A 、C2C B、B2B C、B2C D、C2B
【简答题】It can be inferred from the passage that the author would disapprove of ________. A) investment in computers B) the use of one’s internal computer C) double-check on computers D) complete dependence o...
【单选题】The author seems to disapprove of______.
A.
the shutting of schools in Kalkaska
B.
the involvement of the mass media
C.
the Michigan lawmakers' endless debating
D.
delaying the passage of the school funding legislation
【单选题】Which of the following groups disapprove of the university combination?
A.
The board members of the involved universities.
B.
High school students seeking for better education.
C.
The professors teaching at the universities.
D.
The federal and state governments.
【单选题】It can be inferred from the passage that the author would disapprove of______.
A.
investment in computers
B.
the use of one's internal computer
C.
double-check on computers
D.
complete dependence on computers for decision -making
【单选题】计算：（a﹣2b） 2 的正确结果是 [ ]
A.
a 2 ﹣4b 2
B.
a 2 ﹣2ab﹣4b 2
C.
a 2 ﹣4ab﹣4b 2
D.
a 2 ﹣4ab+4b 2
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