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题目：
单选题
A膳食营养推荐摄入量
B营养生理需要量
C营养质量指数
D食品水分活性
E人体每日容许摄入量
答案：
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慢性心房纤颤是指心房纤颤病史（）
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动轨检车检查出几何轨道状态Ⅳ级偏差时，对本线限速不超（），如120km/h标准检查出Ⅳ级偏差时，应封锁线路。
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如何强化煤粉气流的着火与燃烧？
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无线电频谱资源是由通信运营商所有的。
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下面（）情况不能在“Windows安全中心”中查明。
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GLH-40DC-B型光缆接续，加强芯距CS外护套切口长度为（）mm
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回答题: Exercise Being Good or BadCan exercise be a bad thing? Sudden death during or soon after strenuous exertion on the squash court or on the army training grounds, is not unheard of. 51 trained marathon runners are not immune to fatal heart attacks. But no one knows just 52 common these sudden deaths linked to exercise are. The registration andinvestigation of such 53 is very patchy; only a national survey could determine the true 54 of sudden deaths in sports. But the climate of medical opinion is shifting in 55 of exercise, for the person recovering from a heart attack as 56 as the average lazy individual. Training can help the victim of a heart attack bylowering the 57 of oxygen the heart needs at any given level of work 58 the patient can do more before reaching the point where chest pains indicate a heart starved of oxygen. The question is, should middle-aged people, 59 .particular, be screened for signs of heart disease before 60 vigorous exercise?Most cases of sudden death in sport are caused by lethal arrhythmias in the beating of the heart, often in people 61 undiagnosed coronary heart disease. In North America 62 over 35 is advised to have a physical check-up and even an exercise electrocardiogram. The British, on the whole, think all this testing isunnecessary. Not many people die from exercise, 63 , and ECGs ( 心电图 ) are notoriously inaccurate. However, two medical cardiologists at the Victoria Infirmary in Glasgow, advocate screening by exercise ECG for people over 40, or younger people 64 at risk of developing coronary heart disease. Individuals showing a particular abnormality in their ECGs 65 , they say, a 10 to 20 times greater risk of subsequently developing signs of coronary heart disease, or of sudden death.第51题应选：
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下列对中国古代专制主义中央集权的评述，正确的是（）
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（）是指钻头在井底转动，破碎岩石形成井眼的钻进时间。
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以下（）属于矢量图制作软件