Dozens of companies these days are
hawking genetic testing kits, which claim to give consumers a glimpse of their
future health. But how accurate are they Perhaps not very, according to
witnesses at U. S. Senate hearing here today, as well a report released
concurrently by the Government Accountability Office (GAO), Congress’s
investigation arm. There are genetic tests for more than 1000 conditions. While in some cases, such as cystic fibrosis, having a particular set of mutations all but guarantees disease, in many others it correlates only with an increase in disease risk. For example, mutations in the BRCA1 and BRCA2 genes correspond with a roughly 50% to 80% risk of breast cancer. DNA tests are regulated by the Clinical Laboratory Improvement Amendments (CLIA), which, some critics have charged, lacks the ability to effec A. C.CLI [多选题]滑轮式补偿装置的组成有( )。
A.坠砣杆 B.补偿绳 C.连接零件 D.坠砣 [多选题]在执行重大灭火救援作战、重大演训行动等任务时,应当全面了解掌握任务性质()潜在风险、保障条件,重点监管行动安全的薄弱环节以及安全预案、风险评估、安全措施等落实情况。
A.A组织领导 B.B安全需求 C.C周边环境 D.D岗位人员 [单选题]在纯电感单相交流电路中,电压( )电流。
A.超前 B.滞后 C.既不超前也不滞后 D.相反180° [单选题]电气化区段到发线接触网停电时,须经( )准许并发布命令。
A.供电段调度员 B.列车调度员 C.变电所值班员 D.接触网工区工长 [单项选择]下列SQL语句中,( )语句用于创建表。
A. CREATETABLE B. CREATEINDEX C. ALTERTABLE D. DROP [单选题]在导航栏的缩放工具中,单击缩放工具下拉列表,其中不包含以下哪个命令?()
A.区域放大 B.放大两倍 C.缩小两倍 D.缩放匹配 [填空题]标签标注时,如将大田用种标注为原种,则属于()与标签标注的内容不符。
[判断题]行车前应对机动车驾驶室、发动机舱、车外部、轮胎进行检查。
[单选题]列尾装置故障或未挂列尾主机开行的列车,由( )负责确认整列到达。
A.调车人员 B.货检员 C.车站人员 D.车辆人员 [单选题]CPU的主要功能是进行( )。
A.算术运算 B.逻辑运算 C.算术逻辑运算 D.算术逻辑运算与全机的控制 [判断题]高铁变配电所高压开关柜采用SF6气体绝缘全封闭组合电器QIS。
A.正确 B.错误 [多选题]在线监测系统监测装置运行灯亮、站控监测单元运行应正常、就地显示装置面板显示应正常、外观应( ),油气管路接口应无渗漏。
A.无锈蚀 B.密封良好 C.接地可靠 D.连接紧固 E.驱潮装置工作正常 [判断题]中间站停车,司机必须对机车主要部件进行检查。
A.正确 B.错误 [单项选择]《汉书•武帝本纪》记载:元封元年春,武帝登临嵩山,随从的吏卒们都听到了山中隐隐传来了三声高呼万岁的声音。所以“山呼”万岁后来就成为臣子朝见皇帝的定仪。“山呼”万岁实质是宣扬()
A. 皇权至上 B. 君权神授 C. 天赋人权 D. 天人合一 我来回答: 提交
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