热门试题:
[单选题] 10kV电力电缆绝缘电阻应不低于（ ）MΩ。
A.200
B.300
C.400
D.500。
[单选题]通过电气化铁路平交道口的机动车辆及运输工具，在装载高度超过（ ）m的货物上，通过道口时严禁坐人；持有木棒、竹竿、彩旗等高长物件的行人通过道口时，不准高举挥动，须将物件保持水平状态。
A.2
B.3
C.5
D.7
[单项选择]Her dress was studiously arranged in a more ______ taste.
A. female
B. womanly
C. feminine
D. womanish
[判断题]最大工作速度通常指机器人单关节速度。
A.正确
B.错误
[单项选择]下列关于抗战防御阶段的叙述，不正确的是（）
A. 日本实行速战速决的方针
B. 中国实行全面抗战路线
C. 抗战的主力在国民党正面战场
D. 八路军，新四军严重威胁敌人后方
[判断题]电流互感器二次绕组接地其目的是防止绝缘击穿时二次侧串入高压,威胁人身和设备安全。 ( )
A.正确
B.错误
[单选题]大额外币现钞存入个人账户，应扫描（）至作业中心审核。
A.外汇局签章的《存入外币现钞备案表》
B.中华人民共和国海关进境旅客行李物品申报单
C.存款人原存款银行外币现钞存入单据
D.外汇局签章的《提取外币现钞备案表》
[判断题]起吊重物不准让其长期悬在空中。有重物暂时悬在空中时，禁止驾驶人员离开驾驶室或做其他工作。
A.正确
B.错误
[单项选择]下列选项中不属于限额领料依据的是（）
A. 施工承包合同
B. 准确的工程量
C. 施工组织设计
D. 企业内部消耗定额
[多选题]公安机关办理行政案件,对于下列物品可以扣押的是( )。
A.在检查违法行为人住所时发现的违法嫌疑人与其他共同违法嫌疑人之间预谋违法所书写的信件
B.现场查获的违法行为人持有的实施故意伤害他人的刀具
C.违反治安管理行为人窃得,但已为被侵害人自力救济取回的财物
D.违法行为人实施违法行为所穿的人民警察制式服装
[单项选择]目前用于病因性预防的首选抗疟药物是（）
A. 氯喹
B. 伯氨喹
C. 乙胺嘧啶
D. 乙胺丁醇
E. 利福平
[单选题]电缆直埋敷设施工前应先查清（），再开挖足够数量的样洞和样沟，摸清地下管线分布情况，以确定电缆敷设位置及确保不损坏运行电缆和其他地下管线。
A.图纸
B.电缆运行记录
C.历史资料
D.电缆出厂资料
[单选题]变换成规定的分列式队形后，支队指挥员下达“齐步——走” 的口令；听到口令后，支队机关人员齐步前进，其余分队依次待前一分队离开约( )米时。
A.15
B.18
C.20
D.22
[单项选择]酸枣仁与远志共有的药理作用是
A. 镇咳
B. 祛痰
C. 抗惊厥
D. 降温
E. 降血脂
[单选题]参与公司系统所承担电气工作的外单位或外来工作人员应熟悉本规程，经考试合格，并经（ ）认可，方可参加工作。
A.相关单位分管领导
B.设备运维管理单位
C.安全监督管理部门
D.调度控制中心
[多选题]公司一般因素分析主要分析( )
A.
公司的发展前景
B.
公司的竞争能力
C.
公司的财务报表
D.
公司的经营管理能力
[单选题]69．有关黄体发育不全，下述哪项是正确的
A.．多见于青春期妇女
B.．基础体温单相
C.．月经周期缩短
D.．经期延长
E.．体温下降缓慢
[判断题]>锰属于有色金属。 ( )
A.正确
B.错误
[多选题]当断路器机械特性测试合闸时间、合闸速度不满足规范要求时，可能造成的原因有（）。
A.合闸电磁铁顶杆与合闸掣子位置不合适
B.合闸弹簧疲劳
C.分闸弹簧拉紧力过大
D.开距或超程不满足要求
[单选题]列宁曾经指出,唯物史观的创立将唯心主义从它的最后避难所中驱逐出去了。这里“最后的避难所”指的是
A.自在自然和人化自然
B.人类社会历史领域
C.人类思维领域
D.主观世界和客观世界
[判断题]《公民道德建设实施纲要》是我国第一部关于道德的法律文本。
A.正确
B.错误
[单项选择]治疗风寒表实证，应首选的药物是
A. 紫苏
B. 防风
C. 荆芥
D. 生姜
E. 麻黄
[单选题]干粉泡沫联用消防车是一种同时装备( ) 灭火装置的灭火消防车。
A.泡沫、二氧化碳、干粉
B.泡沫、二氧化碳、水
C.泡沫、氮气、干粉
D.泡沫、水、干粉
[判断题]运算器的主要功能是进行算术运算，不能进行逻辑运算。
A.正确
B.错误
[单选题]B-B-005 3
重庆二号线4编组单轨列车HS10型压缩机电动机的额定转速是（ ）R.P.M。
A.1420
B.1450
C.1480
D.1490
[单选题]10．在我军现行的伤标中，白色代表
A.出血
B.放射损伤
C.毒剂中毒
D.骨折
E.传染病
[判断题]受贿罪的主体是国家工作人员。
A.正确
B.错误
[单选题]凡在坠落高度基准面（）米及以上的高处进行的作业，都应视作高处作业。
A.1.0
B.2.0
C.3.0
D.4.0
[简答题]C类作业施工完毕后，施工负责人确认施工区域出清后到{|*|}销点。
[单项选择]在进行筹资决策分析时，总杠杆系数可以理解为( )之间的比率。
A. 息前税前盈余变动率与销售额变动率
B. 普通股每股收益变动率与销售额变动率
C. 普通股每股收益变动率与息前税前盈余变动率
D. 息前税前盈余变动率与普通股每股收益变动率
[单选题]线路作业中使用开门滑车时，应（），防止绳索自动跑出。
A.检查开门勾环
B.打开开门勾环
C.将开门勾环锁死
D.将开门勾环扣紧
[单项选择]急性病毒性心肌炎病人的最主要的护理措施是( )
A. 保证病人绝对卧床休息
B. 保证蛋白质的供给
C. 给予易消化的饮食
D. 给予多种维生素
E. 严格记录每日出入液量
[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 in-crease 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 com-binations 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 in-creased 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 counter-acting 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 obvi-ously reduces its richness. However,it is not clear how such disturbance damages the main-tenance 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]【单选题】 露点温度指空气在水汽含量和气压都不变的情 况下，冷却到饱和时的温度，形象的说，就是空气中的水蒸气变为露 珠时候的温度叫露点温度。下述哪个正确？ （ ）
A.当空气中水汽已达饱和状态时，气温与露点温度相同
B.当水汽未达到饱和时，气温一定低于露点温度
C. 在 100%的相对湿度时，周围环境的温度高于露点温度
