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【单选题】
正确用系统命名法给下列化合物命名的选项是：A.
顺-2,3-二氯-2-丁烯
B.
反-2,3-二氯-2-丁烯
C.
(Z)-2,3-二氯-2-丁烯
D.
顺-1,2-二甲基-1,2-二氯乙烯
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举一反三
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【简答题】Olfactics is the study of communication via _______.
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A.
submitting
B.
switching
C.
transforming
D.
transmitting
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【单选题】Communication via e-mail is by far the most common Internet activity. You can(71 )with anyone in the world who has an Internet address or e-mail(72)with a system connection to the Internet. All you ne...
A.
connect
B.
exchange
C.
communicate
D.
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