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【单选题】
下列哪个是内消旋化合物A.
1,2- 二溴丁烷
B.
2,3- 二溴戊烷
C.
2,4- 二溴戊烷
D.
1,3- 二溴丁烷
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反馈参考答案：
举一反三
【单选题】One morning he found ____ handbag. There was ____ "s" on the corner of ____ handbag.
A.
a, an; the
B.
a; a; the
C.
a; a; a
D.
the; an; a
【简答题】What did Peter find when he woke up one morning? He found that the floor of his room was ______.
【简答题】阅读理解。 One morning, Jim Reed checked his e-mail. He found a strange message on the e-mail. It was from a woman in Pittsburgh, Pennsylvania. He had talked to her on e-mail many times in the last ten day...
【单选题】“As Gregor Samsa awoke one morning from uneasy dreams he found himself transformed in his bed into a gigantic insect.”
A.
The Metamorphosis , Franz Kafka
B.
Faust , Johann Wolfgang von Goethe
C.
Angels and Insects , A. S. Byatt
D.
Kiss of the Spider Woman , Manuel Puig
【单选题】One morning he found a bag. There was ______ “s” on the corner of ____bag.
A.
a, a
B.
a, the
C.
an, a
D.
an, the
【简答题】闭环控制系统的反馈装置是装在
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