热门试题:
[单项选择]古代建筑的屋顶举折与起翘与以下哪个因素无关?()
A. 采光
B. 排水
C. 等级
D. 抗震
[判断题]1.53. 第53题
在装表接电后,不需要汇集整理有关资料、建档立户。
A.正确
B.错误
[单选题] 十九届六中全会指出, 一百年来, 党领导人民进行伟大奋斗, 积累了宝贵的历史经验,这就是(), 以上各方面,是经过长期实践积累的宝贵经验, 是党和人民共同创造的精神财富, 必须倍加珍惜、 长期坚持,并在新时代实践中不断丰富和发展。
①坚持党的领导②坚持人民至上③坚持理论创新④坚持独
立自 主⑤坚持中国道路⑥坚持胸怀天下⑦坚持开拓创新⑧
坚持敢于斗争⑨坚持统一战线⑩坚持自我革命。
A.①②③④⑤⑥⑦⑧⑨⑩
B.①②③④⑤⑦⑧⑨⑩
C.①②④⑤⑥⑦⑧⑨⑩
D.①②③④⑤⑥⑧⑨⑩
[单选题]KRL系列液压复轨器属于( )。
A.倾摆式
B.三角形支撑式
C.直顶横移式
D.拉复式
[单选题]施工单位的项目负责人应当由()担任,对建设工程项目的安全施工负责,落实安全生产责任制度、安全生产规章制度和操作规程,确保安全生产费用的有效使用,并根据工程的特点组织制定安全施工措施,消除安全事故隐患,及时、如实报告生产安全事故。
A.施工单位指定的人员
B.建设单位指定的人员
C.取得相应执业资格的人员
D.监理单位人员
[不定项选择题]共用题干
Ants Have Big Impact on Environment as“Ecosystem Engineers”
Research by the University of Exeter has revealed that ants have a big impact on their local environment as a result of their activity as“ecosystem engineers”and predators. The study,published in the Journal of Animal Ecology,found that ants have two distinct effects on their local environment.
Firstly,through moving of soil by nest building activity and by collecting food they af-fect the level of nutrients in the soil. This can indirectly impact the local populations of many animal groups,from decomposers to species much higher up the food chain.
Secondly,they prey on a wide range of other animals,including larger prey which can be attacked by vast numbers of ant workers.
Dirk Sanders,an author of the study from the university's Centre for Ecology and Con-servation,said:“Ants are very effective predators which thrive in huge numbers. They're al-so very territorial and very aggressive,defending their resources and territory against other predators. All of this means they have a strong influence on their surrounding area.”
“In this research,we studied for the first time how big this impact is and the subtleties of it. What we found is that despite being predators,their presence can also lead to an increase in density and diversity of other animal groups. They genuinely play a key role in the local environment,having a big influence on the grassland food web,”Sanders said.
The study,carried out in Germany,studied the impact of the presence of different combinations and densities of black garden ants and common red ants,both species which can be found across Europe,including in the UK.It found that a low density of ants in an area increased the diversity and density of other animals in the local area,particularly the density of herbivores and decomposers. At higher densities ants had no or the opposite effect,showing that predation is counteracting the positive influence.
Dr Frank van Veen,another author on the study,said:“What we find is that the impact of ants on soil nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their predatory impacts have the bigger effect一thereby counteracting the positive influence via ecosystem engineering.”
Ants are important components of ecosystems not only because they constitute a great part of the animal biomass but also because they act as ecosystem engineers. Ant biodiversity is incredibly high and these organisms are highly responsive to human impact,which obviously reduces its richness. However,it is not clear how such disturbance damages the maintenance of ant services to the ecosystem. Ants are important in below ground processes through the alteration of the physical and chemical environment and through their effects on plants,microorganisms,and other soil organisms.
What still remains unclear about ants,according to the last paragraph?
A.What roles do ants play in the ecosystem in which they live?
B.How do ants affect the animal diversity in a given ecosystem?
C.How do human activities affect ants'influence on a given ecosystem?
D.How do ants alter the physical and chemical environment?
[单选题]企业固定资产可以按照其价值和使用情况,确定采用某一方法计提折旧,它所依据的会计核算前提是( )。
A.会计主体
B.持续经营
C.会计分期
D.货币计量
[单选题]火场基本安全因素对消防员的伤害表述不正确的是( )。
A.火焰的危害主要是指火焰的烧伤。
B.高温的危害主要指热传播(如高温的热气流、炽热体、强烈的热辐射等)对人体的伤害。
C.浓烟、缺氧的安全危害主要是指烟雾的遮光性。
[多项选择]管道防腐包括表面清理和喷刷涂料,其中表面清理一般可分为()。
A. 除油
B. 除锈
C. 油清洗
D. 酸洗
[单项选择]轴承正常工作温度不超过()。
A. 60℃
B. 70℃
C. 80℃
D. 90℃
[单选题]急性肾功能衰竭少尿结束,24小时尿量至少增加至
A.100ml;
B.200ml;
C.300ml;
D.400ml;
E.500ml;
[多选题]下面是路由器A的BGP部分配置,根据给出的配置,描述错误的是?[RouterA] bgp 10[RouterA-bgp] Router-ID 1.1.1.1[RouterA-bgp] peer 200.1.4.2 as as-number 30[RouterA-bgp] peer 200.1.4.2 as as-number 20 [RouterA-bgp] import-route direct
A.路由器A在AS10
B.路由器A与BGP中引入了自己的直连路由,该直连路由的ORIGIN属性标识为i
C.路由器A与邻居200.1.4.2是EBGP邻居关系
D.路由器A与邻居200.1.2.2是IBGP邻居关系
[单项选择]下列属于必需氨基酸的是()
A. 甘氨酸
B. 丙氨酸
C. 精氨酸
D. 苯丙氨酸
E. 半胱氨酸
[判断题]生产经营单位委托社会服务机构提供风险管控与隐患治理服务的,安全生产责任由社会服务机构负责( )
A.正确
B.错误
[单项选择]一氧化碳中毒阴竭阳脱证,治疗应首选的方剂是()
A. 藿兰苍荷汤
B. 补阳还五汤
C. 生脉注射液合参附注射液
D. 涤痰汤
[判断题]空调控制柜冷凝风机热继电器KLD29、KLD35型机组高速冷凝风机调定5.0A,普通冷凝风机调定4A。
A.正确
B.错误
[判断题]47. 行政机关不能委托其他机关或者组织执法。
A.正确
B.错误
[单选题]根据《治安管理处罚法》的规定,下列应当收缴的是()。
A.违法所得
B.违反治安管理所得的财物
C.赌资
D.直接用于实施违反治安管理行为的工具
[判断题]安全帽帽内衬垫不能过低。
A.正确
B.错误
[单项选择]公司构成的机理在于经营风险的()
A. 二次分散
B. 三次分散
C. 四次分散
D. 五次分散
[判断题]【技能鉴定2019 技师】44.无论正常和事故情况下,带电体与地或带电体相间都不会发生电击穿的间距叫做安全间距( )。
A.正确
B.错误
[单选题]线路属于其他单位,应由检修(施工)单位事先( ),经配合线路的设备运维管理单位同意并实施停电,接地。
A.口头传达
B.书面申请
C.电话通知
D.网上通知
[单选题]电气化铁路平交道口,安全揭示牌由( )负责安装及维护。
A.工务设备管理单位
B.供电设备管理单位
C.工程建设单位
D.产权单位
[单项选择]仪表、电气、机械人员必须和操作人员密切配合,在修理机械、调整仪表、电气时,应事先办理()
A. 交接手续
B. 方案
C. 安全作业票(证)
D. 承诺书
[多选题]依据《中国南方电网有限责任公司电力安全工作规程》(Q/CSG 510001-2015)第6.1.2.3、6.3.1.6、14.3.1条规定:本次事故间接原因包括( )
A. 安全交代流于形式
B. 现场安全监护履职出现真空
C. 材料及工器具摆放错误
D. 未开展现场勘查,方案编制不严格
[单选题]作为人体防静电的措施之一是( )。
A.应穿戴防静电工作服、鞋和手套
B.应注意远离水、金属等良导体
C.应定时检测静电
[单选题]预防机车辆伤害,下列行为正确的是( )。
A.严禁扒车代步,慢速行驶的车辆可以跳车
B.无车来时,可以在刚轨上,车底下,道心坐卧休息
C.严禁在运行中的机车、车辆前方抢越
[多选题](多选题). 反相高效液相色谱法常用流动相为( )
A.甲醇-水
B.乙醇-水
C.乙腈-水
D.氯仿-水
[多选题]消防斧分为( )等类型。
A.尖斧
B.平斧
C.腰斧
D.板斧
[单选题]高压加热器在工况变化时热应力主要发生在( )。
A.管束上;
B.壳体上;
C.管板上;
D.进汽口。
[单选题]门玻璃已破碎并下掉,站务人员应在( )分钟内将破碎玻璃清理完毕,防止玻璃碎片掉入轨行区。如果碎玻璃掉进轨道,如影响列车运行时候,需及时提报行调,并及时进行清理
A.3
B.5
C.8
D.10
[单项选择]在一个窗口中使用“ALT+空格”组合键可以()。
A. 打开快捷菜单
B. 打开控制菜单
C. 关闭窗口
D. 打开开始菜单
[单选题] 脚扣使用时,将脚掌穿入脚扣的皮带与脚扣踏板之间,再在皮带扣的扣压两侧接上一段适当长度 的橡胶带,将橡胶带扣在()。
A.脚后跟
B.脚掌
C.小腿
[单项选择]下列各项,属于佐金平木的适应证是
A. 肺热炽盛
B. 肝火炽盛
C. 肝火犯肺
D. 燥邪犯肺
[单项选择]主要用于癫痫大发作及持续状态的药是
A. 地西泮
B. 苯巴比妥
C. 异戊巴比妥
D. 司可巴比妥
E. 硫喷妥钠
[单项选择]《煤矿安全规程》规定,严禁同时使用()台及以上局部通风机向一个工作面供风。
A. 1
B. 2
C. 3
D. 4