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【简答题】
防雷接地(名词解释)
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举一反三
【简答题】什么条件下有源二端网络只存在戴维宁等效电路,不存在诺顿等效电路?
【单选题】What does James like about his job as a nanny?
A.
He has received encouragement from his friends.
B.
He can easily do better than women nannies.
C.
He has more freedom to plan his own work.
D.
He is allowed to try out unusual methods.
【单选题】--- Whose comic book is it? --- It ________ be Daniel’s. He often shares his comic books with his friends.
A.
must
B.
can’t
C.
mustn’t
D.
can
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