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【简答题】
氨基酸处于等电点时,其溶解度 ________________ 。
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皮皮学刷刷变学霸
举一反三
【简答题】设计实验方案,鉴别己烷、己烯、乙醇、溴乙烷四种无色液体。
【单选题】— Have you ever been to Shanghai? — Yes. I there with my father last year.
A.
went
B.
have been
C.
have gone
D.
has been
【单选题】—Have you ever been to Canada? —Yes, I _____ there last year with my parents. [ ]
A.
have been
B.
have gone
C.
went
D.
go