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【单选题】
动物实验中,切断家兔双侧颈部迷走神经后,呼吸的改变是A.
频率加快，幅度减小
B.
频率加快，幅度增大
C.
频率和幅度均不变
D.
频率减慢，幅度减小
E.
频率减慢，幅度增大
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【简答题】土中的自由水包括毛细水和()。
【单选题】We must derive hydrogen from renewable sources with a view to a pure hydrogen economy.
A.
Y
B.
N
C.
NG
【单选题】______, he can now only watch it on TV at home. （1998年考试真题）
A.
Obtaining not a ticket for the match
B.
Not obtaining a ticket for the match
C.
Not having obtained a ticket for the match
D.
Not obtained a ticket for the match
【单选题】Hydrogen is the fundamental element of the universe______it provides the building blocks from which the other elements are produced.
A.
so that
B.
now that
C.
in that
D.
but that
【简答题】We must derive hydrogen from __________________ with a view to a pure hydrogen, economy.
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