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【单选题】
发生共振的条件是()A.
振动频率相同
B.
相位相同
C.
振幅相同
D.
以上都不是
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【单选题】_____ close parents are to their children has a strong influence on the character of the children. [ ]
A.
That
B.
What
C.
Where
D.
How
【单选题】How close parents are to their children ________ strong influence on the character of the children. [ ]
A.
have
B.
having
C.
has
D.
to have
【简答题】A．Most parents in Britain smack their children. B．Very few parents smack their children every day. C．Many parents fail to see things from the child's point of view. D．If children misbehave, they have ...
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