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【单选题】
26个英文字母(区分大小写)，等概率出现的话，每个字母的信息量约为( )比特。A.
26
B.
52
C.
4.7
D.
5.7
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【简答题】There are many kinds of flowers in it.
【单选题】How many different kinds of amino acids can be found in plant and animal proteins?
A.
10
B.
20
C.
30
D.
40
【简答题】有效源高、烟气抬升高度、烟囱几何高度的关系。
【单选题】There are ______ of books in the school library. [ ]
A.
many kinds
B.
much kinds
C.
many kind
D.
much kind
【简答题】It is good to keep animals in zoos. Zoos are places for people to see many different kinds of animals from all over the world. Without zoos, most people would never see a real tiger or bear. Secondly,...
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