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【单选题】
润滑油溶剂精制的溶剂不包括( )A.
糠醛
B.
苯酚
C.
N-甲基吡咯烷酮
D.
甲苯
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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】非关税壁垒(non-tariff barriers)
【简答题】 非关税壁垒(Non-Tariff Barriers-NTBS)
【单选题】Mount Heng is a place of interest with different kinds of __ .
A.
tree
B.
plants
C.
animal
【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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