问题
问答题 简答题
什么是电动机的额定转速n？
答案
参考答案：
电动机在额定电压、额定功率和额定功率下工作时转轴的转速，叫做额定转速，拖动大小不同的负载时，转速也不同。一般空载转速略高于额定转速，过载时转速会低于额定转速。单位为“r/min”。
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什么是电动机的额定转速n？
参考答案：
电动机在额定电压、额定功率和额定功率下工作时转轴的转速，叫做额定转速，拖动大小不同的负载时，转速也不同。一般空载转速略高于额定转速，过载时转速会低于额定转速。单位为“r/min”。
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 nd reading e-mail have become one of the most popular daily activities around the world, either for business or for pleasure. Now, more and more teachers and students are __1__ this form (形 式) of communication to __2__ their language skills, particularly in English. E-mail has become so popular because it's quite __3__. In the past, teachers often __4__ pen pal projects so that their students could __5__ ideas with their pen pals. But sending and __6__ paper letters could take a few weeks sometimes, so students might lose __7__ in the project some day. Now with e-mail, __8__ , messages can be sent or received __9__ on the Internet. __10__ of waiting for days or weeks, students can receive a reply during days, hours, or even minutes. |