热门试题:
[简答题]《普规》规定:列车在到达线路内()、企业自备机车进入站内交接线整列取送作业,可不使用调车作业通知单。
[单选题]冻害垫板作业,垫入顺垫板总厚度不得超过( )。
A.10mm
B.15mm
C.20mm
D.25mm
E.略
[单选题]下列关于私募基金的说法错误的是( )。
A.是一类特殊的机构投资者
B.投资产品面向不超过200人的特定投资者发行
C.所受的法律约束比公募基金多
D.投资渠道、投资策略都会更为多样化
[多选题]我国药典记载的半夏炮制品有
A.姜半夏
B.清半夏
C.法半夏
D.煎半夏
E.炒半夏
[多项选择]建设工程招标应具备的条件是()
A. 招标人已经依法成立
B. 初步设计及概算应当履行审批手续的,已经批准
C. 招标范围、方式和组织形式等应当履行核准手续的,已经核准
D. 有相应资金或资金来源已经落实,且有招标所需设计图纸及技术资料
E. 发布了招标公告
[单项选择]根据我国税法的规定,印花税是在A股和B股成交后对( )按照规定的税率征收的税。
A. 卖方
B. 买方
C. 卖方和买方共担
D. 卖方和买方分别担当
[单项选择]有五个成员组成的新产品研发小组,内部一般应该采用的沟通形式是()
A. 链状沟通
B. Y型沟通
C. 环状沟通
D. 交错型沟通
[判断题]气门间隙是指气门杆尾端与气门挺柱或气门杆尾端与摇臂之间的间隙。( )
A.正确
B.错误
[单项选择]止回阀的作用是()液体倒流。
A. 加快
B. 阻止
C. 调节开度
D. 控制
[单项选择]肾岩翻花的病机多责之于()
A. 湿热下注
B. 肝肾阴虚
C. 肝脾不和
D. 脾肾阳虚
E. 心火下移
[简答题]抗美援朝期间,中国人民志愿军的司令员是谁?
[单选题]以下哪个部件绝缘低时绝缘监测系统不起作用。( )
A.高压控制盒
B.空调压缩机
C.制动真空泵
D.车载充电机
[多项选择]在进行水压试验前,球罐应具备的条件有( )。
A. 基础二次灌浆已达到设计强度
B. 支柱支撑杆调整紧固完毕
C. 本体及附件的组装、焊接和检验工作全部结束
D. 球罐焊后热处理工作已全部结束,并检验合格
[判断题]高压配电线路不得进行地电位作业。
A.正确
B.错误
[简答题]根据检测结果将接触网分为哪几种量值来界定?(应知应会-《维规》第79条)
[单项选择]回首20年来的援藏路,18个省市、17家央企、66个中央国家机关,近6000名干部前赴后继,实施援藏项目7000多个,带去援藏资金260亿元。20年间,西藏经济总量增长了13倍,水电、学校、医院等公共设施取得了长足进步,西藏人民的幸福指数不断提升。20年来的援藏()①决定了我国实行民族区域自治基本制度②是西藏自治区经济社会发展的根本举措③增强了民族平等和民族团结的物质基础④体现我国平等团结互助和谐的民族关系
A. ①②
B. ①④
C. ②④
D. ③④
[单项选择]"医方是一种专家形象,在双方关系中居于完全主动地位;而患者对医学知识一知半解、甚至一无所知,处于被动地位,完全听命于医方发出的指令"反映的是()的医患关系。
A. 主动被动型
B. 指导合作型
C. 共同参与型
D. 消费型
[单选题]突发事件应急处置工作结束后,相关部门及下属单位应在( )个工作日内完成应急救援工作总结报告,并报公司安委办。
A.2
B.3
C.4
D.5
[单选题]有限空间作业,作业人员与监护人应确定(),测试通讯工具信号良好。
A.作业结束时间
B.信息记录方式
C.有效沟通方式
[单选题]"动极者,镇之以静"所说明的阴阳之间的关系是
A.对立制约
B.相互消长
C.阴阳平衡
D.互根互用
E.阴阳转化
[单项选择]有关对国家土地所有权性质不可变更原则的叙述,不正确的是()。
A. 现实中存在的土地所有权的转移只能是集体所有的土地经依法征收转归国家所有
B. 国家所有的土地可以由农民集体长期使用
C. 国家所有的土地能转为集体所有
D. 土地所有权的买卖、赠与、互易和以土地所有权作为投资,均属非法
[单选题]在用起重机械至少()进行一次日常维护保养和自行检查,()进行一次全面检查,保持起重机械的正常状态。
A.每周,每年
B.每月,每年
C.每季,每年
[判断题]民法所称的“以上”、“以下”、“以外”、“届满”,包括本数;所称的“不满”、“超过”、“以内”,不包括本数( )
A.正确
B.错误
[单项选择]对天然气相对密度下列说法正确的是()。
A. 相对密度不是一个定植
B. 相对密度的值为1
C. 相对密度是一个定值
D. 相对密度的值为0.1
[单项选择]高等学校教学过程具有专业性、独立性、创造性和()。
A. 逻辑性
B. 理论性
C. 层次性
D. 实践性
[单选题] 定期检查的时间间隔,一般与过滤器的检修期相同,通常为( )个月(中)
A.1
B.2
C.6
D.12
[单项选择]肺结核并发症中,下列哪项较常见
A. 支气管扩张
B. 脓胸
C. 气胸
D. 肺外播散
E. 肺气肿
[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.
Dirk Sanders'study centered on how ants______.
A.can manage to thrive in huge numbers
B.defend their resources and territory against other predators
C.attack those invading animals for survival
D.produce such a big impact on the environment
[简答题]指出下列句子中通假字并说明意义。善!吾闻穷巷多怪,曲学多辨。
[判断题]电网重要断面联络线跳闸导致地区电网解列,且地区电网有功缺额,需采取限电措施时,应从无人值班站侧试送,有人值班站侧同期。( )
A.正确
B.错误
[多选题]减速器外壳发热的原因有( )。
A.A、速器中油量过多
B.B、速器中油量过少
C.C、润滑油使用过久
D.D、轴承被损坏
E.E、减速器内部不清洁
[判断题]人在梯子上时,若要移动梯子必须采取可靠的安全措施。
A.正确
B.错误
[单选题]一种认识是不是真理,要看它( )。
A.能否满足人们的需要
B.能否被多数人认可
C.能否付诸实践
D.能否在实践中最终取得预期的效果
[单选题]( )负责核发危险化学品及其包装物、容器生产企业的工业产品生产许可证,并依法对其产品质量实施监督,负责对进出口危险化学品及其包装实施检验。
A. 质量监督检验检疫部门
B. 安全生产监督局
C. 公安部门
[单选题]做瘘管造影时应用的造影剂是
A.30%泛影葡胺
B.10%碘油
C.40%碘油
D.60%碘水
E.以上皆不是
[判断题]混床电导大于0.2us/cm时应再生。
A.正确
B.错误