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换流站直流侧避雷器的参考电压一般定义为直流1mA电压，即避雷器起始动作电压，是决定避雷器（）的主要参数。
A
阀片材料特性
B
几何尺寸
C
串并联片数
D
防污等级
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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. It can be inferred from the passage that England is rarely hit by high magnitude earthquakes.（）
企业文化是一个完整体系，这个体系是由若干相互联系、又具独特作用的要素构成的。()
服务质量特性包括哪些内容？
无级半主动式悬架是指阻尼力连续可调。（）
平行的铁轨向远方延伸时，看起来趋向于相交，因此，在画面上两条直线越趋向接近，就表示距离越远，这是深度线索的（）在起作用。
既是我国法律体系的根本大法，也是教育类法律的根本大法的是（）。
氧中毒