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【简答题】
Write an essay (of about 120 words) about human relationships in our society. The following hints might serve as a guide: a. The problems existing in the relationships between people in our society. b. The negative results such problems may bring about to our society. c. What can you do to help establish a harmonious society as a student? Hint words: distrust / in fear of / sense of insecurity / harm / isolated/ care about / trustworthy /encouragement/ do good deeds / invaluable / live harmoniously
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【简答题】有一轮系如下图所示。试求：
【简答题】汽车发电机转子的功用是 ,定子则是 ,整流器是将定子绕组产生的三相交流电转变成直流电输出,并阻止蓄电池的电流向发电机倒流。
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