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【单选题】
41 下列化合物中,哪一种是Claisen酯缩合反应的催化剂?
A.
Na/甲苯
B.
NaOH
C.
NaOC2H5
D.
异丙醇铝
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【单选题】My parents offered me an amount of money adequate to _______ an apartment, but I ’ ve decided to buy one myself. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
purchase
B.
pursue
C.
permanent
D.
proclaim
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made sure
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thought over
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A.
正确
B.
错误
【单选题】排粪反射的初级中枢位于 ( )。
A.
A. 脊髓腰骶段
B.
B. 脊髓胸段
C.
C. 延髓
D.
D. 脑桥
E.
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A.
that is all right
B.
it doesn't matter
C.
yes, i'd love to
D.
be careful
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【简答题】n.托儿所,保育室,苗圃_______
【判断题】意识不仅是自然界长期发展的产物,而且是社会历史的产物.
A.
正确
B.
错误
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