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（）是造成皮肤老化的外在原因。
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风机在大修或改造后要进行连续运行()小时试验。A.4-6B.6-8C.4-8D.4-7
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光伏并网系统通常由三部分构成：光伏陈列、逆变器和（）。
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下述有关肺炎衣原体肺炎临床特点描述不正确的是（）
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梅毒血清试验目前较常用的方法为（）
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结节病的X线征象包括（）
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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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收款凭证左上角的“借方科目”应当按照收款的性质填写“库存现金”或者“银行存款”，日期应当填写所附原始凭证的日期。
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远处小岛上有两个横向分布的陡峰，间距为1nmile，海面以上高度均为36m，本船雷达天线海面以上高度为16m，本船离岛至少（）nmile外时，小岛回波将分离成两个回波。
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对肠易激综合征的诊断推荐采用国际认同的罗马Ⅱ标准，其中有关腹部不适或腹痛时间的规定是在过去12个月内至少累计达（）