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【单选题】
甲型强心苷元和乙型强心苷元的主要区别是:( )A.
甾体母核稠合方式
B.
C 10 位取代基不同
C.
C 5 -H的构型
D.
C 17 位侧链内酯环不同
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【单选题】Here___ ___number of people. ___ number of them___fifty.
A.
are, a; The, is
B.
is ,the; A, are
C.
is, a; The are
D.
are, the; A, is
【简答题】A sign is another kind of language. Here are some of them that you see on the roads. Number one is a sign with the number thirty on it. When drivers see this sign , they must not go at more than thirt...
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