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某课外小组模拟上述部分过程设计了如下实验装置制备硝酸（所有橡胶制品均已被保护） （1）工业上用氨气制取NO的化学方程式是 。 （2）连接好装置后，首先进行的操作是 。 （3）通入a气体的目的是 . （4）Na 2 CO 3 溶液的烧杯为尾气处理装置，该装置中发生反应的化学方程式是 2NO 2 +Na 2 CO 3 =====NaNO 2 + + （5）已知：温度低于21.15°C时，NO 2 几乎全部转变为N 2 O 2 。工业上可用N 2 O 4 与水反应来提高硝酸产率。N 2 O 4 与a气体在冷水中生成硝酸的化学方程式是 。 （6）一定条件下，某密闭容器中N 2 O 4 和NO 2 的混合气体达到平衡时，c（NO 2 ）=0.500mol/L，c（N 2 O 4 ）=0.125mol/L。则2NO 2 （g） N 2 O 4 （g）的平衡常数K= 。若NO 2 起始浓度为2mol/L，相同条件下，NO 2 的最大转化率为 。
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A.
people in English-speaking countries are cold
B.
the Chinese think the friend of a friend is also our friend
C.
people in English-speaking countries have a smaller circle of friends
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A.
number or letter
B.
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C.
note or message
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A.
destroyed．
B.
broke
C.
smashed．
D.
changed
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A.
other than
B.
more than
C.
rather than
D.
less than
【单选题】The first English colony in America was founded in Virginia. Between 1607 and 1733, the British established______colonies along the east coast of North America.
A.
12
B.
13
C.
14
D.
15
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