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△/ YY 换接的异步电动机的定子绕组共有 和 两种连接方式 , 电动机低速时定子绕组接成 , 高速 。 高速运转时的转速一定为低速运转时的 倍 。
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【单选题】听力原文： Leonardo da Vinci was born in 1452 in Tuscany. As early as 1466, he was working in a workshop. Then in 1482 he moved to Milan. After the plague has swept the city of Milan in 1484～ 1485, he turn...
A.
25.
B.
30.
C.
35.
D.
40.
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【单选题】What has happened to the children of working mothers?
A.
They are in government-supported day care centers.
B.
They are in private day care centers.
C.
Their grandmothers take care of them.
D.
They are sent to boarding school.
【单选题】听力原文： Leonardo da Vinci was born in 1452 in Taskani. As early as 1466, he was working in a workshop. Then, in 1482, he moved to Milan. After the plague had swept the city in Milan in 1484-85, he turne...
A.
25.
B.
30.
C.
35.
D.
40
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