主页
学科
搜索
账户
常见问题
当前学科:无机及分析化学
题目:
多选
鉴定烯烃或炔烃,可用下列哪几种方法().
A . A、溴-四氯化碳混合试剂反应
B . B、高锰酸钾溶液反应
C . C、炔化银法
D . D、过氧气化氢法
答案:
<查看本题扣1积分>
查看答案
答案不对?请尝试站内搜索
推荐知识点:
以下可申请特别授权的是()。
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:
有关AIDS的病理改变的描述,正确的是()
全面从严治党获得卓著成效,为党和国家事业发展提供了坚强的()保证。
商朝在实行父死子继的继承制度后,又逐渐实行了()
PBX交换机配线箱一般采用回线配置,即交换机用户或者中继线卡在配线箱的左边,用户电话线卡在配线箱的(),并通过跳线连接。
提高受教育者的道德水平是教育的首要目标
根据我国(保险法)的规定,保险公司必须聘用经工商管理机构认可的精算专业人员,建立精算报告制度()。
能推动电子沿导体流动的一种力量,也可以说是电流的一种动力,称之为()。
老年性低氧血症的主要原因是()