选择题:This article is mainly about________. ( )(本题2.0分)

题目内容:
This article is mainly about________. ( )(本题2.0分) A the lives of school children
B the cause of arguments in schools
C how to analyze youth violence
D how to deal with school conflicts

参考答案:

当系统发生功率缺额、频率降低时,由于水轮发电机 _____ ,所以在电力系统中把它作为紧急投入运行之

当系统发生功率缺额、频率降低时,由于水轮发电机 _____ ,所以在电力系统中把它作为紧急投入运行之用。

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系统发生两相短路接地故障时,复合序网的连接方式为( ) A. 正序、负序、零序并联B. 正序、负序并

系统发生两相短路接地故障时,复合序网的连接方式为( ) A. 正序、负序、零序并联B. 正序、负序并联、零序网开路C. 正序、零序并联、负序开路

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