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有一实验室要对刚进的诊断试剂进行评价，除对试剂的生产商的资质核查外，还检查了试剂的国内（或国外）批准文号、推荐资料以及实验室与临床观察资料以及说明书内容，内外包装，有效期长短等。该实验室用100份血清以参比试验进行检测，5份血清为真阳性，95份血清为真阴性。用该试剂试验，检测出4份为阳性，96份为阴性，则该试剂的灵敏度为（）。
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正位胸片上关于正常肺门的论述错误的是：（）
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对于我国50Hz系统，要求在短路后的20ms时，二次暂态电压峰值不应大于短路前电压峰值的0.1
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音素i和u的不同是由（）决定的：
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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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地铁信号标志是对列车乘坐人员起指导作用的标志。
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运行中出现哪些现象时，应使用保险闸进行紧急制动？
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易合并亚急性感染性心内膜炎的先天性心血管疾病有（）
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怀疑肛管直肠肿瘤，最简单而重要的检查是（）
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谷类食物蛋白质中（）含量最少，其次为（），则称其为第一、第二限制氨基酸。