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【单选题】
下列有机物中只有 SP 3 杂化碳原子的是( )A.
异丙烷
B.
丙烯
C.
1- 丁炔
D.
乙苯
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反馈参考答案：
举一反三
【简答题】水提法提取蛋白质时,怎样除去共存的多糖、无机盐和苷类等杂质?
【简答题】1) That kingdom was small but rich. Everybody there lived happily. a. That kingdom was small but rich, _____ everybody there lived happily. b. In that kingdom, _______ was small but rich, everybody ...
【单选题】She lived happily. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
S+V+O
B.
S+LV+P
C.
S+V
【单选题】In a harmonious society,we'd better pr pollution _______ happily. [ ]
A.
to live
B.
lived
C.
living
D.
beinglived
【单选题】以下哪一项不是有关虚电路交换方式的正确描述
A.
虚电路标识符用于建立终端间传输路径与终端间传输的数据之间的绑定
B.
虚电路是指终端间传输路径
C.
某条虚电路对应的转发项只给出该虚电路经过的两个端口之间的关联
D.
分组需要包含虚电路标识符
【单选题】With all the things she needed _____, she went home happily. [ ]
A.
to buy
B.
to be bought
C.
buying
D.
bought
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