热门试题:
[判断题]高处作业时不用佩戴劳动防护用品。
A.正确
B.错误
[单选题]《铁路旅客运输规程》规定:李某因急事未来得及买票,要求乘车去××站,列车同意上车补票,应( )。
A.补收所乘区间的票价
B.补收票价,核收手续费
C.按规定补票,加收票款
D.按规定补票,加收50%的票款,核收手续费
[单选题]职业技能等级认定合格的人员,由( )颁发职业技能等级认定证书。
A.备案的认定机构
B.所在地省级
C.国家
[判断题]锯轨时,应全截面垂直锯断,钢轨钻孔后不必倒楞。
A.正确
B.错误
[多选题]绝缘油击穿电压检测需要的试剂与材料有( )。
A.氢氧化钾
B.标准规
C.丙酮
D.石油醚
[填空题]
玉米的抗病和不抗病(基因为A、a)、高杆和矮杆(基因为B、b)是两对独立遗传的相对性状。现有不抗病矮杆玉米种子(甲),研究人员欲培育抗病高杆玉米,进行以下实验:取适量的甲,用合适剂量的γ射线照射后种植,在后代中观察到白化苗4株、抗病矮杆1株(乙)和不抗病高杆1株(丙)。将乙与丙杂交,F1中出现抗病高杆、抗病矮杆、不抗病高杆、不抗病矮杆。选F1中的抗病高杆植株上的花药进行离体培养获得幼苗,经秋水仙素处理后选出纯合二倍体的抗病高杆植株(丁)。另一实验表明,以甲和丁为亲本进行杂交,子一代均为抗病高杆。请回答:
对上述1株白化苗的研究发现,控制其叶绿素合成的基因缺失了一段DNA,因此该基因不能正常(),功能丧失,无法合成叶绿素,表明该白化苗的变异具有()的特点,该变异类型属于()。
[单项选择]In recent decades, there is a phenomenon which makes us give some attention: the so-called Southeast Asian "tigers" have rivaled the western "lions" for stock cliches that make economic headlines. The myth of American economic hegemony(霸权) over Asia in the imposing and patriarchal figure of Uncle Sam has provided frequent political grist (有利) for Southeast Asian political leaders, particularly Malaysia’s Prime Minister Mahathir. He has attempted to forge an international reputation as a snarling tiger, but lately sounds more like a barnyard dog groaning at shadows. Without demeaning in any way the remarkable achievements of the newly developing economies of Malaysia, Thailand and Indonesia, these nations at times appear to be their own worst enemies. This is often exemplified by Dr. Mahathir, who rails at Western evil whenever an international or domestic crisis provides an opportunity.
To be more specific, the recent devaluation of the Philippine and Thai currencies, and the subs
A. Sarcastic and prejudice.
B. Objective and detached.
C. Piercing and indifferent.
D. Impassive and hostile.
[单选题]我国正处在城镇化快速发展时期,城市建设取得显著成就,同时也存在开发强度高、硬质铺装多等问题,改变了城市原有的自然生态本底和水文特征。70%以上的降雨形成径流,城市“大雨必涝、雨后即旱”,引发水生态恶化、水资源紧缺、水环境污染、水安全缺乏保障等问题,严重影响了群众生产生活和城市有序运行。发达国家也曾出现过类似情况,但其通过及时调整城市规划建设理念,实施低影响开发模式、可持续排水管理、水敏感城市设计等,合理控制雨水径流,有效解决了上述问题。海绵城市,就是充分发挥原始地形地貌对降雨的积存作用,充分发挥自然下垫面和生态本底对雨水的渗透作用,充分发挥植被、土壤、湿地等对水质的自然净化作用,使城市像“海绵”一样,对雨水具有吸收和释放功能,能够弹性地适应环境变化和应对自然灾害。2015年10月,国务院办公厅下发《关于推进海绵城市建设的指导意见》,要求通过海绵城市建设,最大限度地减少城市开发建设对生态环境的影响,将70%的降雨就地消纳和利用。与此同时,正式确定了推进“时间表”,要求到2020年,城市建成区20%以上的面积达到目标要求;到2030年,城市建成区80%以上的面积达到目标要求。党的十八届五中全会提出,促进人与自然和谐共生,构建科学合理的城市化格局、农业发展格局、生态安全格局、自然岸线格局,推动建立绿色低碳循环发展产业体系。关于建设海绵城市的构想与推进,正是上述绿色发展思路的一个生动实践与具体努力。
建设海绵城市统筹推进新老城区海绵城市建设的突破口是:( )
A.危房改造以及老旧小区的有机更新
B.解决城市内涝、雨水收集利用、黑臭水体治理
C.海绵型建筑与小区的推广
D.对填湖造地、截弯取直、河道硬化等破坏水生态环境行为的禁止
[单选题]肝性脑病患者服用肠道抗生素的主要目的是
A.防止胃肠道感染
B.防止肝胆系统感染
C.抑制肠道对氨的吸收
D.防止腹水感染
E.抑制肠道细菌产氨
[单项选择]博物馆藏品中的自然标本一般以()标本为主。
A. 生物
B. 化石
C. 岩矿
[多选题]6.公民、法人或者其他组织对行政机关实施行政许可的行为不服的,可以采取哪些救济手段?( )
A.申请行政复议
B.提起行政诉讼
C.提起民事诉讼
D.提起刑事自诉
[判断题]抢险救援消防车液压牵引绞盘严禁超限、垂直起吊、牵引人等操作。
[单选题]下列物质( )不可能发生爆炸。
A.铝粉
B.生石灰
C.面粉
[单选题]在牵引供电设备检修人员到达并采取措施以前,任何人员均应距已断线索或异物处所( )以外。
A.2米
B.4米
C.4.5米
D.10米
[判断题]用户变、配电站的工作许可人应是持有效证书的高压电气工作人员。
A.正确
B.错误
[单选题]为了维持配电线路及附属设备的安全运行和必须的供电可靠性而进行的工作,称为()。
A.维修
B.大修
C.事故抢修
D.改进工程
[判断题]当零件磨损后降低了设备生产率,就应该更换。
A.正确
B.错误
[单选题]作业人员在接触运用中的二次设备箱体前,应( )确认其确无电压。
A.用高压验电器;
B.用低压验电器或测电笔
C.以手触试
D.看带电显示
E.略
F.略
[判断题] 云计算环境下用户面临的安全问题是由数据外包与服务外包带来的。(待验证)
A.正确
B.错误
[单项选择]脑室系统不包括()。
A. 松果体上隐窝
B. 孟氏孔(室间孔)
C. 侧孔
D. 外侧裂
E. 麦氏孔(中孔)
[单项选择]( )是公安工作的根本态度。
A. 一切依靠群众
B. 从群众中来,到群众中去
C. 一切为了群众
D. 服务群众、保护群众
[单项选择]超声波在人体软组织中传播的主要方式是()
A. 表面波
B. 横波
C. 纵波
D. 反射波
E. 折射波
[判断题]依据《中国南方电网有限责任公司电力安全工作规程》,林区、牧区施工现场,禁止吸烟及使用明火。()
A.正确
B.错误
[判断题]当调节过程不稳定时,可增大积分时间或加大比例度,使其稳定。 ( )
A.正确
B.错误
[单项选择]患者因乏力、心悸、头晕、感染、发热2个月来医院检查,诊断为再障,其发病首位病因是()
A. 药物及化学物质
B. 电离辐射
C. 感染
D. 慢性失血
E. 遗传
[多选题] 引起高分液面波动的原因有( )。
A.循环氢量波动
B.高分压力波动
C.进料量大幅波动
D.控制阀失灵
[单选题]应急救援消防车、持《山东省安全事故应急救援车辆通行证》的车辆按其他免征-“()”放行。
A.A.应急救援
B.其他1
C.其他2
D.救灾车
[判断题]( )杀虫剂与虫体接触后,经过虫体体壁渗透到体内引起中毒,这类杀虫剂叫触杀剂。
A.正确
B.错误
[单选题]下列哪种情况不是中期妊娠引产的禁忌证
A.有肝肾功能损害
B.有急性心绞痛
C.有急性阑尾炎
D.有低热,体温37.2℃
E.有急性泌尿系感染
[判断题]虽然已进入媒体时代,但公安机关仍应坚持多做少说,甚至只做不说的传统,以不变应万变。()
题型:判断题
A.正确
B.错误
[单选题]东风7G型机车12V240ZJ6型系列柴油机的几何压缩比为()。
A.A 12:1
B. B 11:1
C. C 12.5:1
[不定项选择题]共用题干
Cancer Drug Trials Often Halted Early
An increasing number of clinical trials for new cancer treatments are being halted before the risks and benefits have been fully evaluated,say Italian researchers,who warn that this growing trend could put patients at risk of harm from new therapies rushed into use.
The researchers looked at 25 randomized,controlled clinical trials that were stopped ear-ly because the treatments had started to show benefit to patients.
“When we analyzed 25 trials over a 10-year period between 1997 and 2007,we found a consistent increase in prematurely stopped trials一more than 50 percent were stopped within the last three years,”study co-author Giovanni Apolone said at a news conference Tuesday.
Of 14 trials halted early and published between 2005 and 2007,the researchers found that 11(79 percent)of them were used to support drug approval applications submitted to the European Medicines Agency and the U.S.Food and Drug Administration.
“This suggests a strong commercial component in stopping trials prematurely.In fact, this strategy could guarantee quicker access to the market for companies.On the other hand, a quicker clinical drug development may lead to an ‘immature’benefit/risk balance of new drugs,”Apolone said.
He and his colleagues“are aware that trials stopped early because they are showing ben-efit may result in identification of promising new treatments for patients.However,findings obtained following this strategy should be considered to be preliminary results that require subsequent confirmation.”
It can take several years for the long-term benefits or harmful side effects of a new treat-ment to become apparent, Apolone noted, but the average duration(持续时间)of the 25 studies he and his colleagues analyzed was 30 months,with a range from 12 to 64 months.
They also found that at the time five of the studies were stopped,they'd enrolled less than 40 percent of the total number of patients planned for final analysis.
“Clinical trials need to stop early for superior benefit whenever there's proof beyond rea- sonable doubt that the new treatment really is superior.That would be an ethical obligation,” Stuart Pocock,a professor of medical statistics at the London School of Hygiene and Tropi-cal Medicine in the United Kingdom,said at the news conference.“However,too many trials are stopped early claiming efficacy(功效)without strong evidence being available.”
Participants in the trials were happy when they were stopped early.
A.Right
B.Wrong
C.Not mentioned
[单选题]热继电器具有一定的( )自动调节补偿功能。
A.时间
B.频率
C.温度
[判断题] 无菌室使用完毕后,需清理物品,并开启日光灯消毒灭菌30min左右。 ( )
A.正确
B.错误
[填空题]在数据库的外模式、模式和内模式三级模式的体系结构中,存在两级映像:外模式到模式的映像定义了外模式与模式之间的对应关系;模式到内模式的映像定义了数据库的逻辑结构与【 】之间的对应关系。