单项选择题

4) Refer to the figure below, which shows a country's possible production possibility frontiers and indifference curves. If the country is producing at ________, then moving to ________ will cause utility to ________.

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LCI同步调速系统在起动和低速时存在那些换流问题?

答案: 低速时同步电动机感应电动势不够大,不足以保证可靠换流;当电机静止时,感应电动势为零,根本就无法换流。
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