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简述医疗器械的定义及目的。
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采用新结构、新材料、新工艺的建设工程和特殊结构的建设工程，设计单位应当在设计中提出保障施工作业人员安全和预防生产安全事故的措施建议。
根据下列材料，回答下面的题目 For the 26 month．mysterious falls of large chunks of ice(冰雹) 27 rained down on Spain and Italy．Juana Sanchez。a 70一year—old woman in Almeria，southern Spain，was knocked 28 when she was struck on the shoulder by a falling ice chunk 29 she walked in a street 30 her home．On January l2，just about 200 miles away in Seville，a man narrowly 3l serious injury when a 9-pound ball of ice32into his car．33 me evening of January 27 priests at the salesian monastery in L，Aquila，Italy were startled by．a loud crash． 34 the noise，the dlscovered a large chunk of ice on their yard，35 intact． Upon examination。the block of ice 36 in at 2 kilograms and no source 37．On the same day，about l00 miles northeast in Ancona,Italy，the local officials were called to investigate the report of a maIl 38 was struck 39 the head by a l kilogram chunk of ice that apparently fell from the sky． spain and Italy area"the only European40 getting attacked by huge ice blocks in January On JaIluary 2 in Surrey，England(southwest of London)，an East Indian man was walkingthrough Newton Amletic Park when he41a strange whistling sound overhead．‘Seconds 42 ，a large hunk of ice fell out of the clear blue sky and pounded in‘to the soft ground，shattering over a 50 foot—wide area．The ice dug a hole of a foot deep and a foot in di锄eter． Even the shattered remnins of the mystery ice were as large as tennis balls and were described as opaque 43 no unusual color or smell． Although eyewitnesses to the phenomenon report that they did not see anything in the sky that could account 44 the ice，scientists had to come up with a rationalization．Professor Jesus Mar tinez Frias，the geologist investigating the ice falls in Spain，told BBC News t}lat me ice Dieces had probably been 45through sudden temperature drops in the stratosphere．nlis was the most like1y explanation，he said，for the‘‘very unusual”phenomenon．
设计单位应当按照法律、法规和工程建设强制性标准进行设计，防止因设计不合理导致生产安全事故的发生。
简述体癣和股癣的临床表现。
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