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【单选题】
自耦变压器的特点( )
A.
一次、二次绕组之间只有磁的耦合
B.
一次、二次绕组之间只有电的联系
C.
只有一个绕组,因此没有一次、二次绕组之分
D.
一次、二次绕组之间不仅有磁的耦合,而且有电的 联系
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B.
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C.
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D.
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【单选题】关于功率,下列说法中正确的是
A.
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【简答题】Jack is six. He is old enough to go to school. On the first day, his teacher teaches him three words,“l, you, he”.Then the teacher says, “I am your teacher. You are my student. He is your classmate.” ...
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