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【单选题】
当励磁电源电压不变而频率从50Hz改变为60Hz时，交流电磁系统的磁动势和电磁吸力如何变化。( )A.
磁动势不变，电磁吸力减小
B.
磁动势增大，电磁吸力减小
C.
磁动势不变，电磁吸力增大
D.
磁动势减小，电磁吸力增大
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【判断题】The WTO is described as an umbrella organization under which the agreements that came out of the Uruguay Round of multilateral trade negotiations are gathered．（ ）
A.
正确
B.
错误
【单选题】The headquarters of the WTO is（）.
A.
New York，U.S.A.
B.
Paris，France
C.
Geneva，Switzerland
D.
Sydney，Australia
【判断题】The WTO is described as an umbrella organization under which the agreement that came out of the Uruguay Round of multilateral trade negotiations are gathered. （ ）
A.
正确
B.
错误
【单选题】The WTO is described as an umbrella organization under which the agreement that came out of the Uruguay Round of muhilateral trade negotiations are gathered．( )
A.
正确
B.
错误
【简答题】.Someone says that the WTO is a general agreement of talk and talk.Some others say the WTO is just a great trap that the developed countries hunted resources from the developing countries through the ...
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