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【简答题】
当电源电压降低时，三相异步电动机的起动转矩（）
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反馈参考答案：
举一反三
【单选题】The tropical year differs from which year by 20 minutes ().
A.
Astronomical year
B.
Natural year
C.
Equinoctial year
D.
Sidereal year
【单选题】—______? —She is tall and thin. [ ]
A.
What’s Mrs Brown like
B.
What does Mrs Brown have
C.
What does Mrs Brown like
D.
What does Mrs Brown look like
【单选题】The latest year for which figures could be obtained is______.
A.
the year the author wrote the article
B.
1977
C.
any year between 1977 and 1983
D.
1983
【单选题】Which year was designated by the United Nations as the International Illiteracy Year'?
A.
1991.
B.
1990.
C.
I992.
D.
1993.
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