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【单选题】
指出下列两种化合物之间的关系( )A.
同一化合物
B.
对映异构体
C.
非对映异构体
D.
无法判断
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【简答题】建筑装饰工程特点是什么?
【单选题】Chitin is a homopolymer of N-acetyl-D-glucosamine units in ________ linkage. It is a primary component of cell walls in fungi, the exoskeletons of arthropods, such as crustaceans and insects, the radu...
A.
β( 1 ® 2)
B.
β(1→ 3)
C.
β(1→ 4)
D.
β(1→ 6)
【简答题】Traditionally, a sentence is seen as a sequence ofwords. The study of sentence formation, therefore, involves a great deal of thestudy of the word, such as the classification of words in terms of part...
【单选题】In terms of communicative function, how many sentence types are there in English?
A.
6
B.
5
C.
4
D.
3
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