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【简答题】
某铝土矿中主要含有Al 2 O 3 、Al(OH) 3 、AlO(OH)，还含有Fe 2 O 3 等杂质。利用拜耳法生产氧化铝的流程如下图所示： ⑴粉碎后的铝土矿碱浸时高温下进行，其目的是 。 ⑵AlO(OH)与NaOH反应的化学方程式为 。 ⑶在稀释、结晶过程中：稀释的目的是 ；加Al(OH) 3 晶核的目的是促进Al(OH) 3 的析出。上述“稀释、结晶”工艺，也可用通入足量的 气体的方法来代替。 ⑷浓缩所得的NaOH溶液由于吸收了空气中的CO 2 而含有杂质，该杂质可通过苛化反应除去，写出苛化反应的化学方程式： 。 ⑸该生产流程能实现 （填化学式）的循环利用。
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举一反三
【简答题】A．In the morning. B．In the early afternoon. C．In the evening. D．At midnight.
【单选题】Though it was in the midnight, ________ there were a lot of people in the street.
A.
and
B.
but
C.
yet
D.
however
【单选题】In the midnight, I could only hear the _________ of my father's footstep.
A.
echo
B.
dryer
C.
load
D.
fog
【单选题】He __________a good idea in the midnight.
A.
thought to
B.
came up with
C.
ran into
D.
went about
【简答题】In the midnight the telephone suddenly
rang like a thunder, Jordan was wakened and very ____ to answer it.
【简答题】Dad came in the midnight. We heard every sound, but we pretended to be asleep. Next morning he looked weak and thin, sitting in a chair by the kitchen fire. The light of the fire shone through his lon...
【简答题】A．In the afternoon. B．In the evening. C．At midnight. D．In the morning.
【单选题】Bill dares to walk along in the midnight without any hesitation. He is _______.
A.
brave
B.
shy
C.
helpful
D.
patient
【单选题】My answer to the quiz question' Who composed the Midnight Sonata?' was just a shot in the ______. I didn't really know it was Beethoven.
A.
night
B.
air
C.
dark
D.
distance
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