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题目:
未知类型
A.电阻电感性负载
B.纯电阻负载
C.纯感性负载
D.电阻电容性负载
答案:
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Moderate Earthquake Strikes England A moderate earthquake struck parts of southeast England on 28 April 2007, toppling chimneys from houses and rousing residents from their beds. Several thousand people were left without power in Kent County. One woman suffered minor head and neck injuries. "It felt as if the whole house was being slid across like a fun-fair ride," said the woman. The British Geological Survey said the 4. 3-magnitude quake struck at 8:19 a.m. and was centered under the English Channel, about 8.5 miles south of Dover and near the entrance to the Channel Tunnel. Witnesses said cracks appeared in walls and chimneys collapsed across the county. Residents said the tremor had lasted for about 10 to 15 seconds. "I was lying in bed and it felt as if someone had just got up from bed next to me." said Hendrick van Eck, 27, of Canterbury about 60 miles southeast of London. "I then heard the sound of cracking, and it was getting heavier and heavier. It felt as if someone was at the end of my bed hopping up and down." There are thousands of moderate quakes on this scale around the world each year, but they are rare in Britain. The April 28 quake was the strongest in Britain since 2002 when a 4.8-magnitude quake struck the central England city of Birmingham. The country's strongest earthquake took place in the North Sea in 1931, measuring 6.1 on the Richter scale. British Geological Survey scientist Roger Musson said the quake took place on 28 April in an area that had seen several of the biggest earthquakes ever to strike Britain, including one in 1580 that caused damage in London and was felt in France. Musson predicted that it was only a matter of time before another earthquake struck this part of England. However, people should not be scared too much by this prediction, Musson said, as the modern earthquake warning system of Britain should be able to detect a forthcoming quake and announce it several hours before it takes place. This would allow time for people to evacuate and reduce damage to the minimum. The April 28 quake was stronger than the one of 2002.()
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《全国临床检验操作规程》推荐的血细胞染色法是()
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女性,58岁,间歇无痛肉眼血尿2个月余。查体未发现异常。肾脏B超提示右肾中下极4.5cm低回声肿物,向肾外侧突出下列检查中,该患者最不可能出现的情况是()
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新《商标法》禁止抢注因业务往来等关系明知他人已经在先使用的商标。
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下列哪些手段能够帮助企业建立良好的内部外部形象( )。A.协调好公众关系B.促进楼盘销售C.树立企业形象D.建立信息网络
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在三极管符号中,圆圈表示管壳,因而在()电路中,一般将其省略.
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某女,35岁,初产妇,因第二产程延长行会阴后一斜切开及产钳术助产。产后检查:宫底脐下2指,血压15.3/10.7kPa(115/80mmHg)。产后1h产妇感心悸、恶心、口渴、出冷汗,检查阴道流血不多,色暗红,有血凝块;宫底脐上1横指,软;血压10.6/6.7kPa(80/50mmHg)。最可能的原因是()
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天然气中氦含量一般在()。
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TBA/22产品灌注压力()BAr
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投保人的义务主要有()。