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【单选题】
碱性最弱的生物碱是A.
季铵生物碱
B.
叔胺生物碱
C.
胺生物碱
D.
伯胺生物碱
E.
酰胺生物碱
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反馈参考答案：
举一反三
【单选题】The unemployment rate in this district_______ from 6% to 5% in the past two years.
A.
is falling
B.
has fallen
C.
was falling
D.
had fallen
【简答题】根据出版类型说出下列文献的类型: 《机械密封通用规范》( GB/T 33509-2017 )的文献出版类型是( ) 。
【单选题】The unemployment rate in this district_____from 6% to 5% in the past two years.
A.
has fallen
B.
had fallen
C.
is falling
D.
was falling
【单选题】The price of the houses in this district_________from 5% to 7% in the past two months.
A.
has fallen
B.
has been fallen
C.
was fallen
D.
was falling
【单选题】The unemployment rate in this district from 6% -- 5% in the past two years.
A.
has fallen
B.
had fallen
C.
is falling
D.
was falling
【简答题】根据出版类型说出下列文献的类型: 《一种洗碗机的自消毒系统》(A47L15/42) 的文献出版类型是( ) 。
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