热门试题:
[不定项选择题]A.逍遥散合二陈汤加减
A.龙胆泻肝汤加减
B.天王补心丹加减
C.生脉散加减
D.六味地黄丸加减
E.甲状腺功能亢进症之阴虚火旺证的治疗方药为
[多选题]下列对车辆段内列车、车辆运行速度描述正确的是()。
A.试车线:20km/h
B.牵出线:10km/h
C.洗车线:3km/h
D.卸车线:10km/h
[多选题]电力牵引具有( )经济性好等特点。
A.牵引功率
大
B.轴重轻
C.利于环保
D.不受干扰
[单选题] 运行和检修人员巡检过程中,身体不得碰及转动部件,保持与( )的安全距离。
A. 带电设备
B. 遮拦
C. 围栏
D. 防护罩
[单项选择]低钠血症的最早表现为()。
A. 软弱无力
B. 腱反射减退
C. 肠麻痹
D. 心动过缓
E. 不断恶心、呕吐
[单选题]处置高浓度、强渗透性气态危险化学品事故时,应穿着( )。
A. 特级化学防护服
B. 一级化学防护服
C. 二级化学防护服
D. 三级化学防护服
[单选题]营业机构为客户开具财产证明书,若证明金额150万元,有权人签名栏应由( )签字确认
A.经办柜员
B.会计主管
C.营业机构负责人
D.法人机构逐级审批
[单项选择]
A. too
B. only
C. also
D. ever
[不定项选择题]共用题干
Lack of Oxygen Delayed the Rise of Animals on Earth
Scientists have long speculated as to why animal species didn't flourish sooner,once sufficient oxygen covered the Earth's surface. Animals began to prosper at the end of the Proterozoic period,about 800 million years ago-but what about the billion-year stretch before that,when most researchers think there also was plenty of oxygen?
Well,it seems the air wasn't so great then,after all.
In a study published Oct. 3 1 in Science,Yale researcher Noah Planavsky and his colleagues found that oxygen levels during the"boring billion"period were only 0.1%of what they are today .In other words,Earth's atmosphere couldn't have supported a diversity of creatures,no matter what genetic advancements were poised to occur.
"There is no question that genetic and ecological innovation must ultimately be behind the rise of animals,but it is equally unavoidable that animals need a certain level of oxygen,"said Planavsky,colead author of the research along with Christopher Reinhard of the Georgia Institute of Technology.“We're providing the first evidence that oxygen levels were low enough during this period to potentially prevent the rise of animals."
The scientists found their evidence by analyzing chromium(Cr)isotopes in ancient sediments from China,Australia,Canada,and the United States.Chromium is found in the Earth's continental crust,and chromium oxidation is directly linked to the presence of free oxygen in the atmosphere.
Specifically,the team studied samples deposited in shallow,iron-rich ocean areas,near the shore.They compared their data with other samples taken from younger locales known to have higher levels of oxygen.
Oxygen's role in controlling the first appearance of animals has long vexed scientists."We were missing the right approach until now,"Planavsky said."Chromium gave us the proxy."
Previous estimates put the oxygen level at 40%of today's conditions during pre-animal times. leaving open the possibility that oxygen was already plentiful enough to support animal life.
In the new study,the researchers acknowledged that oxygen levels were"highly dynamic"in the early atmosphere,with the potential for occasional spikes. However,they said,"It seems clear that there is a first-order difference in the nature of Earth surface Cr cycling"before and af- ter the rise of animals.
"If we are right,our results will really change how people view the origins of animals and other complex life,and their relationships to the co-evolving environment,"said co-author Tim
Lyons of the University of California-Riverside."This could be a game changer."
"There's a lot'of interest right now in a broader discussion surrounding the role that environ- mental stability played in the evolution of complex life,and we think our results are a significant contribution to that,"Reinhard said.
The team was funded by several research institutes.
A.Right
B.Wrong
C.Not mentioned
[多选题]电话系统保安单元功能包括( )。
A.过压保护
B.维修保护
C.过流保护
D.过载保护
[单选题] (单选题)文化软实力的竞争,本质是不同文化所代表的( )的竞争。
A. 传统精神
B. 精神内涵
C. 道德力量
D. 核心价值观
[单项选择]Why can't you stop your eternal complaining
A. long
B. everlasting
C. temporary
D. boring
[单项选择]关于现代教育管理学科研究的对象,目前提法不一,大体有三种观点:一是主张研究教育管理现象,二是主张研究教育管理过程;三是主张研究()
A. 教育管理规律
B. 教育管理制度
C. 教育管理人
D. 教育管理问题
[多选题] 风险监管核心指标分为:( )
A.风险水平类
B.风险迁徙类
C.风险缓释类
D.风险对冲类
E.风险抵补类
[单选题]消防水泵房、水泵吸水管、出水管上的控制阀应锁定在()位置,并有明显标记。
A.常闭
B.常开
C.半开
D.封闭
[单选题]从确立“两个一百年”奋斗目标到提出“中国梦”,从把握中国经济发展新常态到牢固树立五大发展理念……蕴藏鲜明时代内涵的治国理政总体方略与时俱进、不断发展。治国理政总体方略的发展所体现的哲理是( )。
A.人类社会是一个不断变化发展的过程
B.真理反映的对象是客观事物及其规律
C.真理性的认识随着实践的发展而发展
D.理论是否正确一定要经过实践的检验
[单项选择]马斯洛需要层次理论中最高层次需要是( )
A. 爱与被爱的需要
B. 安全需要
C. 生理需要
D. 尊重的需要
E. 自我实现的需要
[判断题]持用一次性往返铁路免费硬席乘车证,除换乘外,中途下车无效。
A.正确
B.错误
[单项选择]RPI卡环组成中各部分所指的是()。
A. R是指远中支托,P是指近中邻面板,I是指杆式卡环
B. R是指近中支托,P是指近中邻面板,I是指杆式卡环
C. R是指远中支托,P是指远中邻面板,I是指杆式卡环
D. R是指近中支托,P是指远中邻面板,I是指杆式卡环
E. 以上说法均不正确
[单选题]下列不属于电晕的利用的是(____)。
A.静电喷涂
B.臭氧发生器
C.降低操作过电压
D.降低气体间隙的放电电压
[单选题]在保证担保方式中,一般保证与连带责任保证最主要的区别是什么( )。
A.一般保证的保证范围为主债权,连带责任保证的保证范围为全部债权
B.一般保证的保证人享有先诉抗辩权,连带责任担保的保证人不享有这一种权
C.一般保证的保证期间为六个月,连带责任保证的保证期间为两年
D.在同一债权既有保证又有物的担保的情况下
[简答题]长篇小说《高老头》是哪位法国作家的作品?
[单项选择]春茶的祁红具有特殊的“玫瑰香”属于()
A. 品种香
B. 季节香
C. 产地香
D. 茶类香
[单项选择]安宫牛黄丸的功效是
A. 清热开窍,化痰解毒
B. 清热开窍,化浊解毒
C. 清热开窍,辟秽解毒
D. 清热开窍,豁痰解毒
[单项选择]阴门又称()
A. 产门
B. 阴户
C. 子门
D. 阴器
E. 子肠
[判断题]《铁路货物装卸管理规则》第39条规定:装卸机械检修,分为临修、状态修和计划修。
A.正确
B.错误
[多项选择]下列()情况应由有关部门按有关规定追究有关领导和直接责任者的责任,并给予必要的行政、经济处罚。
A. 对事故隐瞒不报、谎报
B. 对事故故意迟延不报
C. 故意破坏事故现场
D. 无正当理由拒绝接受调查
E. 拒绝提供有关情况和资料
[判断题]2.32燃气汽车(包括气体燃料汽车,两用燃料汽车和双燃料汽车)应按规定在车辆前端或者后端醒目位置分别设置标注其使用的气体燃料类型的识别标志。
A.正确
B.错误
[判断题]在化学药品管理时,强氧化剂和强还原剂必须分开存放,使用时轻拿轻放,远离热源。
[判断题]CCTV系统司机立岗处监视器可查看站厅重要部位的视频图像。
A.正确
B.错误
[单选题]职业道德是指( )对道德的要求,是从事这一行业的行为标准和要求。
A.职业本质
B.职业特点
C.职业认知
D.职业习惯
[多选题]墙面装饰的分类按材料及施工方式,主要可以分为:( )
A.抹灰类
B.贴面类
C.涂料类
D.裱糊类
E.铺钉类
[单项选择]根据流动性偏好理论,由利率决定并与利率为减函数关系的货币需求动机是______。
A. 交易动机
B. 预防动机
C. 投机动机
D. 贮藏动机
[单项选择]患者不幸在家中突发心绞痛时,最适宜用来抢救的硝酸甘油制剂是()
A. 舌下含片
B. 注射剂
C. 控释制剂
D. 软膏剂
E. 透皮贴剂
[多选题]负责警戒的人员要着装整齐、带齐()等器材,坚守岗位、注意观察,及时发出声光警示信号。
A. 通讯
B.照明
C. 警戒
D.警示
[单项选择]
阅读下面的短文,文中有15处空白,每处空白给出了4个选项,请根据短文的内容从4个选项中选择1个最佳答案。
{{B}}Animal’s "Sixth
Sense"{{/B}} A tsunami was triggered by an earthquake in the
Indian Ocean in December, 2004. It killed tens of thousands of people in Asia
and East Africa. Wild animals,{{U}} (51) {{/U}}, seem to have escaped
that terrible tsunami. This phenomenon adds weight to notions that they possess
a "sixth sense" for{{U}} (52) {{/U}}, experts said. Sri
Lankan wildlife officials have said the giant waves that killed over 24,000
people along the Indian Ocean island’s coast clearly{{U}} (53)
{{/U}}wild beasts, with no dead animals found. "No elephants
are dead, not{{U}} (54) {{/U}}a dead rabbit. I think animals can{{U}}
(55) {{/U}}disaster. They have a sixth sense. They know when things
are happening," H.D. A. specialist B. assistant C. supporter D. sponsor
[单项选择]( )是指为了适应市场迅速变化和激烈竞争的形势,保持本项目产品在市场的竞争力,项目投产前就要着手建立自己的产品研发机构,能够根据市场的反馈信息,跟踪市场对产品的需要,确保产品在市场占有一定的份额。 A. 确定产品市场营销策略 B. 建立新产品研发机构 C. 建立产品市场营销网络 D. 组织产品售后服务
[多项选择]“马克思主义具有与时俱进的理论品质”,这说明: A. 历史上的马克思主义理论只具有相对性而不能固守 B. 马克思主义要随着时代、实践、科学的发展而不断发展 C. 不应该以教条主义的态度对待马克思主义理论 D. 要坚持马克思主义基本原理同中国的具体实际相结合
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