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25时，如果取0.1 mol·L -1 HA溶液与0.1 mol·L -1 NaOH溶液等体积混合(混合后溶液体积的变化不计)，测得混合溶液的pH＝8，试回答以下问题： （1）混合溶液的pH=8的原因_____________________（用离子方程式表示）； （2）混合溶液中由水电离出的c(H + )_________0.1 mol·L -1 NaOH溶液中由水电离出的c(H + )；(填“＞”、“＜”或“＝”) （3）求出混合液中下列算式的精确计算结果(填具体数字)：c (Na + )－c (A - )＝___________mol·L -1 ； （4）已知NH 4 A溶液为中性，又知将HA溶液加到Na 2 CO 3 溶液中有气体放出，试推断(NH 4 ) 2 CO 3 溶液的 pH_______7 (填“＞”、“＜”或“＝”)； （5）将相同温度下相同浓度的四种溶液： A．NH 3 ·H 2 O B．NH 4 A C．NH 4 HSO 4 D．NH 4 Cl 按NH 4 + 浓度由大到小的顺序排列______________________（填序号）
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【单选题】If a poor country managed to provide enough food for children, the yearly economic growth rate would______.
A.
drop
B.
not change
C.
rise
D.
exceed 2 percent
【简答题】请你结合我国老龄化发展趋势的四个现状,写出你对我国养老产业未来发展的思考?
【简答题】Text 3 The relationship between formal education and economic growth in poor countries is widely misunderstood by economists and politicians alike progress in both area is undoubtedly necessary for th...
【单选题】The relationship between formal education and economic growth in poor countries is widely misunderstood by economists and politicians alike progress in both area is undoubtedly necessary for the socia...
A.
is subject groundless doubts
B.
has fallen victim of bias
C.
is conventional downgraded
D.
has been overestimated
【单选题】Excerpt 1 The relationship between formal education and economic growth in poor countries is widely misunderstood by economists and politicians alike.Progress in both area is undoubtedly necessary for...
A.
is subject groundless doubts
B.
has fallen victim of bias
C.
is conventional downgraded
D.
has been overestimated
【简答题】请你结合我国老龄化发展趋势的四个现状,写出你对我国养老产业未来发展的思考?
【单选题】One of the major causes of student suicide is
A.
poor health.
B.
lack of goals.
C.
economic hardship.
D.
college professor's expectations.
【单选题】Social and economic rights are mainly emphasized in poor countries because ______
A.
these issues are very important for people in those countries.
B.
they are living necessities.
C.
developed countries cannot solve these probrems.
D.
they want to use them to cover up their poor politic rights.
【单选题】The relationship between formal education and economic growth in poor countries is widely misunderstood by economists and politicians alike. Progress in both areas is undoubtedly necessary for the soc...
A.
is subject to groundless doubts
B.
has fallen victim of bias
C.
is conventionally downgraded
D.
has been overestimated
【单选题】The deterioration financial condition referred to was caused by______.
A.
a poor economic approach to the Social Security retirement program
B.
the reform. of welfare in the Social Security retirement program
C.
major policy changes in the Social Security retirement program
D.
government debt in the Social Security retirement program
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