皮皮学，免费搜题
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【单选题】
异烟肼加氨制硝酸银试液即发生气泡与黑色浑浊,并在试管壁上产生,这是因为其分子结构中具有A.
吡啶环
B.
酰胺键
C.
N原子
D.
酰肼基团
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Not until many years later______
A.
the whole truth became known
B.
did the wholetmth become known
C.
the whole truth has become known
D.
has the t讯th become known
【单选题】Not until many years later______
A.
the whole truth became known
B.
has the truth become known
C.
the whole truth has become known
D.
did the whole tmth become known
【单选题】Not until many years later______
A.
the whole truth became known
B.
has the truth become known
C.
the whole truth has become known
D.
did the whole truth become known
【单选题】Not until many years later___known.
A.
the whole truth became
B.
did the whole truth become
C.
the whole truth become
D.
the whole truth had become
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