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【简答题】
油环分为 和组合油环两种。
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】用沉淀法分离混合离子时,如何检验离子的沉淀是否已经完全?
【单选题】●在数据结构的讨论中把数据结构从逻辑上分为 (38) 。 (38)
A.
内部结构与外部结构
B.
静态结构与动态结构
C.
线性结构与非线性结构
D.
紧凑结构与非紧凑结构
【单选题】— Jack, do you know anything about Doctor Brown? — I _____ to him for years. I don't see how anyone else could do better. [ ]
A.
went
B.
will go
C.
had gone
D.
have been doing
【单选题】How's Annie? I _____ her for a long time. [ ]
A.
don't see
B.
won't see
C.
didn't see
D.
haven't seen
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