-
题目：
单选题
A心脏活动受限
B呼吸困难
C动脉压下降和心率减慢
D静脉压升高
E低钠血症
答案：
<查看本题扣1积分>
-
信息安全面临哪些挑战？
-
皇权的行使主要是采取（ ），对臣僚奏事采用审议复核的方法。
-
液氯由液态变为气态体积扩大约()倍。
-
DB31/294-2010，小区摄像机工作时，监控范围内的平均照度应≥（），必要时应设置与摄像机指向一致的辅助照明光源；
-
医疗机构从业人员分为几个类别（）
-
SARS的病原体是（）
-
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：
-
模板的支设方法基本上有两种，即单块就位组拼（）和（），采用预组拼方法，可以加快施工速度，提高工效和模板的安装质量，但必须具备适应的吊装设备和有较大的拼装场地。
-
-
为了避免运动干涉，传动轴中设有由（）和（）组成的滑动花键联接。