British cancer researchers have found
that childhood leukaemia is caused by an infection, and clusters of cases around
industrial sites are the result of population mixing that increases exposure.
The research published in the British Journal of Cancer backs up a 1988 theory
that some as-yet unidentified infection caused leukaemia—not the environmental
factors widely blamed for the disease. "Childhood leukaemia appears to be an unusual result of a common infection," said Sir Richard Doll, an internationally-known cancer expert who first linked tobacco with lung cancer in 1950. "A, virus is the most likely explanation. You would get an increased risk of it if you suddenly put a lot of people from large towns in a rural area, where you might have people who had not been exposed to the infection. "Doll was commenting on the new fi A. the cluster of leukaemia eases around the Sellafield nuclear reprocessing part B. the kind of infection that causes childhood leukaemia C. the causes of childhood leukacmia D. a new findings by British scientists [多选题] 以下关于高压配电网容载比描述正确的是(____)。
A.容载比计算应以行政区县或供电分区作为最小统计分析范围 B.对于负荷发展水平极度不平衡、负荷特性差异较大的地区宜按供电分区计算统计 C.容载比可用于单一变电站、电源汇集外送分析 D.容载比总体宜控制在1.6~2.0范围之间" [单选题] 推力头加温时应有( )监视,现场应有防火措施,加温现场应备有消防器材。
A.温度 B.湿度 C.电流 D.电压 [单项选择]胃的区域淋巴结分为()
A. 3站16组 B. 3站12组 C. 3站9组 D. 2站16组 E. 2站12组 [判断题]在相对论中,光速C、被认为是不可逾越的极限速度。
[多项选择]烟气轮机工作条件极端恶劣,指的是()。
A. 高温 B. 高压 C. 烟气中含有催化剂颗粒 D. 烟气中含有H2S [单选题]按照疫情防控相关要求,各施工单位复工前除满足教育培训、考试考核相关要求外,还应自行筹备必要的口罩、消毒液等防护物品,原则上储备不低于现场使用( )天的所需量。
A.3 B.5 C.7 D.14 [多选题]监理单位有下列行为之一的,责令限期改正,并处1万元以上3万元以下的罚款;对直接负责的主管人员和其他直接责任人员处1000元以上5000元以下的罚款()。
A.未按照本规定编制监理实施细则的 B.未对危大工程施工实施专项巡视检查的 C.未按照本规定参与组织危大工程验收的 D.未按照本规定建立危大工程安全管理档案的 E.略 F.略 [单选题](66994)光纤熔接机普通电极使用寿命为()次。(1.0分)
A.1000 B.1500 C.2000 D.2500 [单选题]各软管总成和金属橡胶软管生产日期与制造标记不清晰时,该管( )。
A.分解检修 B.重新刻打 C.报废 D.继续使用 [判断题]隧道内的多台机械同时作业时,必须互相通报作作业内容。( )
A.正确 B.错误 [单选题]风力超过( )级时,禁止砍剪高出或接近导线的树木。
A.3 B.4 C.5 D.6 [单选题]当建筑物二层及二层以上楼层发生火灾,消防应急广播应进行( )广播。
A.着火层及相邻的上下层为同一分区 B.本层、二层及地下各层为同一分区 C.地下各层及首层为同一分区 D.起火的防火分区及其相邻的防火分区为同一分区 我来回答: 提交
|