问题
单项选择题
频敏变阻器主要用于（）控制。
A.笼型转子异步电动机的启动
B.绕线转子异步电动机的调速
C.直流电动机的启动
D.绕线转子异步电动机的启动
答案
参考答案：D
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频敏变阻器主要用于（）控制。
A.笼型转子异步电动机的启动
B.绕线转子异步电动机的调速
C.直流电动机的启动
D.绕线转子异步电动机的启动
参考答案：D
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| It's seven in the morning. After 1 , Mr White and Mrs White take their 2 to the school 3 the car. Then they go to work in a 4 . The children have lunch at school. Father and mother have lunch at the factory. There 5 four classes in the morning and two in the afternoon. After 6 , the children stay in the library some time. Sometimes they 7 games with their classmates. Then they go home by school bus. Mother cooks supper for the 8 , The children help their mother do the housework. After supper, the children do 9 . Father and mother watch TV or 10 . | ||||
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