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【简答题】
肝性脑病的假性神经递质学说中假性神经递质指的是__________，_________。他们是由食物中的________氨基酸如_________，_______合成的。其化学结构与正常的神经递质___________相似。
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举一反三
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【单选题】How can such a large quantity of knowledge be ?
A.
acquired
B.
required
C.
remained
D.
attained