热门试题:
[单项选择]A型行为者的冠心病的发病率比B型行为者大（）
A. 1倍
B. 2倍
C. 3倍
D. 4倍
E. 5倍
[判断题]所有车辆上,节气门开度完全取决于加速踏板的位置。( )
A.正确
B.错误
[单选题]下述哪项不是卵巢性闭经( )
A.妇女40岁前绝经
B.假孕性闭经
C.多囊卵巢综合征
D.严重的卵巢炎后所致的闭经
E.产生雄激素的卵巢肿瘤所致的闭经
[判断题]根据《国家三、四等水准测量规范》（ＧＢ１２８９８－９１）规定、在坚硬的地面上、三等水准测量测站的观测程序也可以是：后-前-后-前。该表述（ ）
A.正确
B.错误
[单选题]现场勘查应重点核实客户负荷性质、()、用电类别等信息，结合现场供电条件，初步确定供电电源、计量、 计费方案，并填写现场勘查单。
A.用电负荷
B.用电容量
C.用电指标
D.用电需求
[单选题]钢坯的头尾温差是( )造成的。
A.炉子宽度
B.烧咀火焰
C.钢坯长度
[多选题]依据《机动车查验工作规程》GA801-2019规定,注册登记时, 需要查验整备质量。
A.所有货车
B.客车底盘改装的专项作业车
C.总质量大于750kg的挂车
D.带驾驶室的正三轮摩托车
[不定项选择题]共用题干
Older Volcanic Eruptions
Volcanoes were more destructive in ancient history,not because they were bigger,but because the carbon dioxide they released wiped out life with greater ease.
Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions.Not all volcanic eruptions killed off large numbers of animals,but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock.To his surprise,the older the massive volcanic eruptions were,the more damage they seemed to do.He calculated the"killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava（熔岩）that they produced.He found that size for size,older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.
The Permian（二叠纪）extinction,for example,which happened 250 million years ago,is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe.Those volcanoes are thought to have pumped out about 10 gigatonnes of carbon as carbon dioxide.The global warming that followed wiped out 80 percent of all marine genera（种类）at the time,and it took 5 million years for the planet to recover.Yet 60 million years ago,there was another huge amount of volcanic activity and global warming but no mass extinction.Some animals did disappear but things returned to normal within ten thousand of years."The most recent ones hardly
have an effect at all,"Wignall says.He ignored the extinction which wiped out the dinosaurs 65 million years ago,because many scientists believe it was primarily caused by the impact of an asteroid（小行星）.He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO2．
Vincent Courtill.ot,director of the Paris Geophysical Institute in France,says that Wignall's idea is provocative.But he says it is incredibly hard to do these sorts of calculations.He points out that the killing power of volcanic eruptions depends on how long they lasted.And it is impossible to tell whether the huge blasts lasted for tliousands or millions of years.He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced,and that lava volume may not necessarily correspond to carbon dioxide emissions。
What can be inferred from Paragraph 3 concerning dinosaurs?
A.They were killed off by an asteroid.
B.They died of drastic climate change.
C.They were wiped off by a volcanic eruption.
D.The cause of their extinction has remained a controversial issue.
[判断题]有害有毒气体、可燃气体、粉尘容许浓度应符合国家标准的安全要求，不符合时应采取清洗或置换等措施。（ ）
A.正确
B.错误
[单选题]线路坡度超过（）‰时，原则上不准停留车辆，特殊情况须制定安全措施由路局批准。
A.2
B.3
C.5
D.6
[单选题]利福平是（ ）
A.广谱抗生素
B.药酶抑制药
C.能抑制细胞壁合成的药物
D.单用结核杆菌不
易产生耐药性
[判断题]经路可以是一条进路，也可以是多条进路或进路与区间线路、联络线、走行线等综合构成。（）
A.正确
B.错误
[判断题]如果ATP中未保存应答器链接信息，并且列车通过单应答器组，则ATP应采用P1包向RBC报告位置。（ ）
A.正确
B.错误
[填空题]对不影响安装和使用的一般缺陷,经协商后可由( )处理
[单选题]深入地铁隧道灭火救援的消防人员需要携带的装备不正确的是( )。
A.发光照明线
B.空气呼吸器
C.多功能救援担架
D.可燃气体探测仪
[单选题]触电急救，当采用胸外心脏按压法进行急救时，伤员应仰卧于（ ）上。
A.柔软床垫
B.硬板床或地
C.担架
D.弹簧床
[单选题]具有滋补肝肾、乌须明目功效的药物是( )
A.女贞子
B.枸杞子
C.菟丝子
D.沙苑子
E.决明子
[判断题]交叉点锚喷支护时，使用加长或全长锚固式锚杆，是预防冒顶事故的措施。
A.正确
B.错误
[判断题]在化学反应中停留时间越长生成物中副产物含量越小
A.正确
B.错误
[单选题]正常成人24小时尿量一般约为( )
A.800ml
B.1500ml
C.2500ml
D.3000ml
E.3500ml
[单选题]41.使用半自动闭塞法行车时，列车凭( )显示的允许运行的信号进入区间。
A.A出站信号机
B.B通过信号机
C.C.出站信号机或线路所通过信号机
[单项选择]The very real and far reaching implications inherent in the current changes being experienced by government spaceports, with terms of their effect upon the whole international space community, are also highlighted.
A. for terms of
B. as terms of
C. in terms of
D. from terms of
[单选题]依据《中国南方电网有限责任公司电力安全工作规程》，凿子被锤击部分有伤痕、不平整、沾有油污等，（ ）使用。
A.暂不
B.修复
C.不应
D.加固
[判断题]所有作业均需现场属地人员配合,委外单位的施工作业需由归口管理部门加派一名施工监管人。（ ）
A.正确
B.错误
[判断题]流通加工是改变物质的形状和性质，形成一定产品的活动。
[多项选择]下列各项资本公积可以直接用于转增资本的有( )。
A. 资本溢价
B. 接受现金捐赠
C. 拨款转入金
D. 外币资本折算的差额
E. 股权投资准备
[单选题]消防救援队伍安全管理规定应坚持底线思维和安全发展理念,坚持( )的方针,防范和化解各类安全风险,遏制重特大事故,保持队伍安全稳定,为建设“对党忠诚、纪律严明、赴汤蹈火、竭诚为民”的消防救援队伍提供安全保障。( )
A.防备为主
B.防范为主
C.执勤战备为主
D.预防为主
[多选题]存款保险基金的运用，应当遵循（）的原则。
A.安全
B.流动
C.保值
D.增值
[单选题]C172飞机正常类最大载荷系数是 [单选题] *
A.襟翼收上时+3.8g
B.襟翼放下时+3.8g
C.襟翼放下时-1.52g
[单选题]磁场削弱电阻烧损的原因有：( )。
A.主发电机电流过大
B.牵引电动机励磁绕组短路
C.牵引电动机主极连线断路
[单选题]时间继电器在继电保护中主要实现( )。
A.启动保护
B.出口跳闸
C.动作延时
[单项选择]在有n个结点的二叉链表中，值为非空的链域的个数为 ______。
A. n-1
B. 2n-1
C. n+1
D. 2n+1
[判断题]4.202.
根据《“多表合一”信息采集建设施工工艺规范》，通信接口转换器、直流开关电源、信号中继设备电源进
线应采用线径1.5 mm2塑铜线。( )
A.正确
B.错误
[多项选择]TA7680集成电路主要包含有（）等功能。
A. 中频放大
B. 视频检波
C. 色度解码
D. 行、场振荡
E. 伴音功放
[判断题]病原携带者指本人无临床症状， 但可以将病原体排出体外使别人受到感染的人，这种人对健康人的威胁比病人轻。
A.正确
B.错误
[单选题]单选题: 生产经营单位应在有较大危险因素的生产经营场所和有关设施.设备上,设置明显的安全()标志。
A.警告
B.指示
C.提示
D.警示
