计算题:一台三相电动机接成三角形,功率为4.5kW,线电压220V,功率因数cos=0.85,求线电流和相电流。
参考答案:
答:线电流为13.89A,相电流为8.02A。
首先,请阅读下列来自英国网站http://www.oakleyproperty.com的租房信息。
以下是需要租房的人的信息及要求。请将租房者与适合他们的房子匹配起来。
小题1:Cindy and her husband has just retired. They are tired of the noisy and busy life in London, so they would like to make a change for a period of time. They are considering renting a lovely house to enjoy the quietness and the company of cats and dogs.
小题2:Two Chinese teachers will be sent to East Susses Primary School to teach Chinese this September. The school is looking for a house to rent with two bedrooms and central heating for them to share.
小题3:Ben, a reporter working in the city centre, would like to rent a one bedroom (either single or double) apartment, with easy access to local shops and clubs and to the railway station.
小题4:Daisy and Joan, two university students are looking for a house to rent. They would share the cost (not more than £500 each) and they prefer separate bedrooms and separate kitchen.
小题5:Tom is an exchange student in Britain, whose parents plan to visit him in the winter vacation. Now he is looking for a house to rent for the family. His parents have no specific requirements so long as it’s equipped with daily necessities and good for Tom’s study.
血虚型产后身痛,宜选用的最佳方剂为
A.独活寄生汤
B.生化汤
C.以上都不是
D.黄芪桂枝五物汤
E.身痛逐瘀汤