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下图是实验室制取气体和检验有关性质的一些装置，请回答有关问题： （1）对于氧气、氢气、二氧化碳这几种气体，若用上述装置来制取，无法制得的气体是______，若要制得该气体，需要对哪种装置进行怎样改进？______． （2）如果用装置A制取气体，导管口气泡就立即收集结果会______． （3）从反应物的状态、反应条件和所制气体的性质角度看，装置A适合在______的情况下制取气体． （4）写出实验室运用上述某装置制取二氧化碳的化学方程式______．
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举一反三
【简答题】字符数组中一个元素存放 ________ 个字符。
【单选题】—Can you help me with this question, Tom? —Sorry, it is beyond my________.
A.
power
B.
strength
C.
force
D.
energy
【简答题】C语言中的字符数组中的一个元素存放( )个字符
【简答题】阅读理解 Tom arrived at the bus station quite early for a Paris bus. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in line, and ...
【单选题】Tom Suddenly found his girlfriend walking ________the square, so he forced his way _____the crowd to get close to her.
A.
across; across
B.
over; through
C.
over; into
D.
across; through
【简答题】阅读理解。 Tom arrived at the bus station quite early for Paris bus. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in line, and o...
【简答题】字符数组中的一个元素存放 个字符 。
【简答题】字符数组是用来存放 的数组。字符数组中一个元素存放 个字符。
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