热门试题:
[多选题]电杆上安装电气设备有哪些要求?
A.A、安装应牢固可靠、
B.B、 电气连接应接触紧密,不同金属连接,应有过渡措施、
C.C、 瓷件表面光洁、无裂缝、破损等现象、
D.D、 充油、充气等设备,无渗漏现象。
[填空题]部门规章及地方政府规章可以在一定的条件下设定()或者()的行政处罚。
[单项选择]将痉证分为刚痉、柔痉的专著是
A. 《内经》
B. 《金匮要略》
C. 《诸病源候论》
D. 《医林改错》
E. 《医学明理》
[单选题]以下关于“具有中国特色国际领先的能源互联网企业”中“国际领先”的描述,不正确的是( )。
A.经营实力领先、核心技术领先
B.服务品质领先、企业治理领先
C.绿色发展领先、品牌价值领先
D.经营效益领先、盈利能力领先
[判断题]四显示自动闭塞在列车追踪间隔时间内,一般划分为不少于4个闭塞分区排列信号机。( )[311030204]
A.正确
B.错误
[单选题]自建房的最高抵押率一般是______。
A. .5
B. .6
C. .7
D. .8
[单选题]可采用沸水进行初步热处理加工的烹调原料是()。
A.胡萝卜
B.元鱼块
C.牛肉块
D.豌豆苗
[单选题]紧急牵引时,列车限速( )km/h。
A.15
B.20
C.25
D.30
[单项选择]3个月小儿可以添加()
A. 水果汁
B. 米汤
C. 肝泥
D. 碎肉
E. 软饭
[单选题]处方的核心部分是
A.处方前记
B.调配人员签名
C.划价
D.医师签名
E.处方正文
[单项选择]CSE代表()。
A. 标准氢电极
B. 饱和硫酸铜电极
C. 饱和甘泵电极
D. 饱和氯化银电极
[判断题]未对安全设备进行经常性维护、保养和定期检测的,追究生产经营单位管理责任。
A.正确
B.错误
[单选题]机具和安全工器具入库、出库、使用前应( ),禁止使用损坏、变形、有故障等不合格的机具和安全工器具。
A.检查
B.试验
C.鉴定
D.擦拭
[单项选择]软件工程开发的可行性研究是决定软件项目是否继续开发的关键,而可行性研究的结论主要相关于( )。
A. 软件系统目标
B. 软件的性能
C. 软件的功能
D. 软件的机构属性
[判断题]对于LOF份额的赎回,若T日场内投资者申报基金赎回申请,则自T+1日起,投资者申购份额可用。( )
[多项选择]一户通自动理财服务在以下情况下终止()。
A. 自动理财服务期限届满,且银行不再提供延期服务
B. 客户主动要求终止自动理财服务
C. 约定转账的账户被司法冻结、止付等需提前终止自动理财服务的其他情况
D. 一户通账户余额自结清之日起满一年未发生变动
[单选题]表示换算闸瓦压力的常用单位是( )。
A.kpa
B.kg
C.kg/m
D.kN
[判断题]依据《安全生产法》规定,生产、经营、储存、使用危险物品的车间、商店、仓库不得与员工宿舍在同一座建筑物内,并应当与员工宿舍保持安全距离。
A.正确
B.错误
[单选题]上海轨道交通列车高速断路器是( )控制电器。
A.单极、直流
B.单极、交流
C.多极、直流
D.多极、交流
[单选题]在确认憋压数据录取全后,应打开回压阀门泄压,当压力下降稳定时,启动抽油机,打开( )阀门。
A.生产
B.回压
C.油压
D.掺水(油)
[单项选择]关于车辆改装,以下哪种说法不正确()。
A. 将原车型改制成其他用途的车辆称为车辆改装
B. 改变原车辆的零部件或总成称为汽车改装
C. 车辆改装要技术上可靠
D. 车辆改装要经济上合理
[单选题]除了休息日、节假日之外,中队(站)通常每日出操,每次时间通常( ),主要进行队列训练和体能训练。
A.30分钟
B.1小时
C.2小时
D.15分钟
[单选题]
亨廷顿病患者可出现
A.肌张力增强
B.肌张力不变
C.肌张力降低
D.肌张力先降低后恢复
E.肌张力先亢进后恢复
[判断题]馈线终端的缩略语是TTU。
A.正确
B.错误
[单选题](单选题)2020 年 1 月 1 日,为支持实体经济发展,降低社会融资
实际成本,央行决定于 1 月 6 日下调金融机构存款准备金率( )个百
分点。此次降准将释放长期资金约 8000 多亿元。
A. 0.3
B. 0.5
C. 3
D. 5
[单项选择]The driver was _________.
[填空题]浙江省工商系统数据容灾系统建设包含数据()和()两个主要功能。
[简答题]你市为了建高铁,占用了农民的大量耕地,农民因对赔偿不满四处上访,作为政府工作人员,领导让你来处理,你怎么办?
[单选题]由于原预留印鉴不清、模糊、通过率不高等原因需要客户重新预留的,重新加盖的印鉴,启用日期填写( )。
A.开户日
B.重新加盖的日期
C.原预留印鉴的启用日期
D.重新加盖印鉴的次日
[判断题] 办理工作票延期手续,应在工作票的有效期内,由工作负责人向工作许可人(运维负责人)提出申请,得到同意后给予办理。
A.正确
B.错误
[多选题]采用()的建设工程和特殊结构的建设工程,设计单位应当在设计中提出保障施工作业人员安全和预防生产安全事故的措施建议。
A.新技术
B.新结构
C.新材料
D.新工艺
[多选题]《铁路技术管理规程》中规定,旅客列车包括()。
A.A、特快
B.B、快速
C.C、普通旅客列车
D.D、动车组列车
[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 study revealed that chromium found in Earth's continental crust remained stable before and after the rise of animals.
A.Right
B.Wrong
C.Not mentioned
[判断题]( )取消引导锁闭进路时,应采用人工解锁的方式。
A.正确
B.错误
[填空题]空气的温度反映空气的()程度,相对湿度反映空气的()程度,空气的焓表示空气()的大小。
[单选题]调车色灯复示信号机显示一个月白色灯光,表示调车信号机在 () 。
A. 开放状态
B. 关闭状态
C. 停用状态
D. 。
[多选题]鼠害的防治的主要方法有()。
A.防鼠
B.化学灭鼠
C.器械灭鼠
D.生物灭鼠
E.化学灭鼠