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【单选题】
平流雾的形成需要满足的条件是（）。 Ⅰ．环流条件；Ⅱ．水汽条件；Ⅲ．气压条件；Ⅳ．冷却条件；Ⅴ．云状条件；Ⅵ．稳定度条件。A.
Ⅰ～Ⅳ，Ⅵ
B.
Ⅰ，Ⅱ，Ⅳ～Ⅵ
C.
Ⅰ，Ⅱ，Ⅳ，Ⅵ
D.
Ⅱ，Ⅳ～Ⅵ
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举一反三
【简答题】The author can’t remember his relatives clearly because ________. A) he didn’t live very long with them B) he was fully occupied with observing nature C) he was too young when he lived with them D) th...
【单选题】Why didn't the author's wife and friends ask any more about what had happened?
A.
They didn't want the author to be embarrassed.
B.
They were anxious not to arouse fierce argument.
C.
They became very worried about his safety.
D.
They were interrupted by the doorbell ring.
【简答题】什么是有磁介质时的安培环路定理
【单选题】Years ago we didn ’t know this, but recent science ( ) that people who don ’t se ep well soon get ill.
A.
showed
B.
has shown
C.
will show
D.
is showing
【单选题】有关磁介质中的安培环路定理，下列说法正确的是？
A.
在稳恒磁场中，磁场强度沿任意闭合回路的线积分为零时，闭合回路内不包含电流。
B.
在稳恒磁场中，磁场强度沿任意闭合回路的线积分为零时，闭合回路内包含的电流代数和为零。
C.
在稳恒磁场中，磁场强度沿任意闭合回路的线积分为零时，闭合回路内包含的传导电流代数和为零。
D.
在稳恒磁场中，闭合回路上任意一点的磁场强度只与闭合回路所包围的传导电流有关。
【单选题】why didn’t the author make an apology to her father?
A.
she thought she was right
B.
she couldn’t find the right words.
C.
she was afraid that her father didn’t forgive her.
【单选题】Why didn't the author take any money with him?
A.
Because he didn't have any.
B.
Because he thought it was unnecessary.
C.
Because he didn't want to spend any.
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