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【简答题】
(换元积分法求定积分)运用换元积分法求解定积分 时,可令 ,则新的积分下限为 ,新的积分上限为 ,该定积分的值为 。
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举一反三
【单选题】Why does Jenny go to the bank?
A.
To open an account.
B.
To transfer some money.
C.
To buy some foreign currency.
【单选题】关于胺碘酮的叙述，错误的是（）。
A.
降低窦房结和普肯耶纤维的自律性
B.
减慢普肯耶纤维和房室结的传导速度
C.
延长心房和普肯耶纤维的动作电位时程、有效不应期
D.
阻滞心肌细胞K + 通道
E.
对Na + 、Ca 2+ 通道无阻断作用
【简答题】Why does Jenny go to the Finance
Department?
【简答题】3. Why does Jenny hope to meet Alice on
Saturday?A. Because she is still working now. B. Because she has to go to the post offi ce . C. Because she is busy today. D. Because she doesn’t like going sho...
【单选题】Why does Jenny look worried?
A.
Because she has lost some money.
B.
Because she hasn ’ t got her scholarship payment.
C.
Because she doesn ’ t know how to cash her scholarship payment check.
D.
Because she cannot buy anything with her check.
【简答题】四方连续的骨骼有( )、( )、( )、( )等。
【单选题】关于胺碘酮的叙述，错误的是（）。
A.
阻滞心肌细胞膜钾通道，阻滞钠通道和钙通道
B.
适用于冠心病并发的心律失常
C.
收缩血管
D.
广谱抗心律失常药
E.
拮抗T 3 、T 4 与受体结合
【单选题】下列关于胺碘酮的叙述，错误的是（）
A.
降低窦房结和普肯耶纤维的自律性
B.
减慢普肯耶纤维和房室结的传导速度
C.
延长心房肌、心室肌、普肯耶纤维的APD、ERP
D.
阻滞心肌细胞钠、钙及钾通道
E.
对α、β受体无阻断作用
【单选题】Why does the author state in line 9 that observations are taken 'just once every twelve hours' ?
A.
to show why the observations are of limited value.
B.
to compare data from balloons and computers,
C.
to give an example of international cooperation,
D.
to indicate that the observations are timely.
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