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当关键组分的相对吸收率大于其吸收因子A时，应有结论( )。 a．吸收塔无论有多少个理论级也完不成给定的分离任务； b．吸收塔需有无穷多个理论级才能完成给定分离任务； c．吸收塔有限多个理论级即可完成给定的分离任务；d．上述结论均成立。
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【单选题】It is stated in the passage that the sleepless elite______.
A.
find themselves easy to become angry
B.
have their way to keep a good shape
C.
can do two jobs well in the meantime
D.
depend heavily on coffee to refresh themselves
【单选题】In such a changing, complex society formerly simple solutions to informational needs become complicated. Many of life's problems which were solved by asking family members, friends or colleagues are b...
A.
the lack of stable communities
B.
the breakdown of informal information channels
C.
the increased mobility of families
D.
the growing number of people moving from place to place
【简答题】阅读理解。 London won the right to host the 2012 Summer Olympic s. The British capital will become the first city to host the Olympics three times. London is one of the world's greatest cities. There a...
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