题目内容
1、根据直流电动机用途的不同，可以把直流电动机分为两类，一类是进行能量传递和转换的，称为电机，另外一类是进行信号传递和转换的，称为电机，包括步进电机、伺服电机等。2、直流电动机将能转换为能输出；直流发电机将能转换为能输出。
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Communication is any process in which people share information, ideas and emotions.
Even the same sentences spoken in different contexts may produce totally different effects.
Context is supposed to play a more accurate and central role in communication of our daily life.
For a successful conversation, one needs not have a good understanding of context.
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