热门试题:
[判断题]对于多个省公司需要按品类进行规模采购的，由总部作为招标人应用远程异地评标方式开展采购。
A.正确
B.错误
[单项选择]有关Internet邮件使用的常用关键字说明，选项______是错误的。
A. to是指接收方地址
B. subject是指信息主题
C. CC是指回复地址
D. from是指发送方
[判断题]根据《建设工程质量管理条例》规定，某建设单位将写字楼改建为公寓，需要进行改变建筑物主体结构，必须要有设计方案。
A.正确
B.错误
[判断题]>两名信号员同时作业时,必须坚持联防确认制度。 ( )
A.正确
B.错误
[单选题]甲公司系增值税一般纳税人,2016 年 12 月 31 日,甲公司出售一台原价为 452 万元,已提折旧 364 万元的生产设备,取得的增值税专用发票上注明的价款为 150 万元,增值税税额为 25.5 万元。出售该生产设备发生不含增值税的清理费用 8 万元,不考虑其他因素,甲公司出售该生产设备的利得为( )万元。
A.54
B.87.5
C.62
D.79.5
[单选题]636 低压断路器也称为()。
A. 闸刀
B. 总开关
C. 自动空气开关
[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?
[多项选择]胸痹心痛应该与下列何病症鉴别？
A. 胃脘痛
B. 真心痛
C. 悬饮
D. 胁痛
E. 肺胀
[单项选择]党的县（旗）、自治县、不设区的市和市辖区的委员会的委员和候补委员必须有（）年以上的党龄。
A. 两年
B. 三年
C. 五年
D. 十年
[单项选择]人民警察的业务素质包括岗位专业能力、综合分析能力、应变决断能力、（）和表达能力。
A. 群众工作能力
B. 协调指挥能力
C. 管理沟通能力
D. 擒敌制胜能力
[单项选择]癫痫大发作时最具有特征的表现是
A. 发作性偏瘫
B. 发作性意识障碍
C. 发作性肢体麻木
D. 发作性头痛
E. 发作性强直阵挛抽搐及意识障碍
[单选题] 蚂蚁每天睡多久?
A.几秒钟
B.几分钟
C.半小时
D.几个小时
[判断题]学校所在地有母亲一方时，可以发售探望父亲的学生票。
A.正确
B.错误
[多项选择]病理性近视眼底可出现（）.
A. 黄斑出血
B. 后巩膜葡萄肿
C. Fuchs斑
D. 青光眼杯
E. 周边部视网膜变性
[判断题]144.所有电流互感器和电压互感器的二次绕组至少要有一点永久性的、可靠的保护接地。
A.正确
B.错误
[单项选择]以下不属于清洁机械保养内容的是（）。
A. 漏电安全隐患检查
B. 抹尘
C. 上油养护
D. 设备铭牌
[判断题]铁运(1999)103号 《铁路电力管理规则》规定：巡视检查时应测量各车站、信号楼、联络箱等分界处电流、电压。
A.正确
B.错误
[填空题]在胚胎发育过程中，原口形成动物的口，以这种方式形成口的动物为（）。
[多选题]《工伤保险条例》第十六条(一)项“故意犯罪”的认定,应当以( )为依据。
A.司法机关的生效法律文书
B.司法机关的结论性意见
C.公安机关的认定
D.单位的认定
[单选题]患者男,38岁。主诉4天未解大便,伴头痛、腹痛、腹胀乏力等症状。触诊腹部较紧张可触及硬块,肛诊可触及粪块。诊断为便秘。使用了多种方法也未能排出大便,遵医嘱大量不保留灌肠。
为使该患者保持正常的排便状态,对其进行的正确的健康指导是
A.定时服用缓泻剂、帮助排便
B.少量服用粗纤维的食物
C.每次饮水量不超过1000ml
D.每晚睡前使用开塞露
E.生活规律、定时排便
[单选题]只需调整或更换夹具上个别定位元件或夹紧元件,就可用于装夹不同类型和尺寸的工
件,这类夹具称为( )。
A.通用夹具
B.可调夹具
C.专用夹具
D.组合夹具
[单选题]现场使用的安全工器具应（）并符合有关要求。
A.规范
B.合格
C.齐备
D.可靠
[单选题]110千伏及以上输变电工程同一批次、同一电压等级线路、变电专业同一设计施工监理承包商中标均不得超过（）个标包。
A.1
B.2
C.3
D.4
[判断题]采用DDR，路由器只有在当它们之间有数据包传送时，才拨号建立连接，因此，DDR技术适用于信息量较少的数据包的突发传送
[单选题]下列（ ）不是营销稽查监控系统中的稽查任务类型。
A.常态稽查
B.审核稽查
C.专项稽查
D.定时稽查
[多项选择]甲向乙借款10万元，由丙作为保证人，约定“如果甲到期不能偿还该债务，由丙承担保证责任，直至甲的债务本息还清为止”。下列哪些选项是正确的( )
A. 该保证为一般保证
B. 该保证为连带责任保证
C. 保证期间为主债务履行期届满之日起2年
D. 保证期间为主债务履行期届满之日起6个月
[单选题]依据《江苏省国有资金投资工程建设项目招标投标管理办法》，甲乙两家投标人的投标报价用同一个预算编制软件密码锁制作，上述甲乙两家投标人的行为（）
A.投标人弄虚作假骗取中标的行为
B.属于投标人相互串通投标
C.视为以他人名义投标
D.视为投标人相互串通投标
[判断题]犯组织、领导、参加恐怖组织罪,又实施杀人、爆炸、绑架等犯罪的,应数罪并罚。
A.正确
B.错误
[单选题]《铁路车站行车作业人身安全标准》规定，调车作业不准()。
A.迎面上车
B.背对上车
C.登乘机车
D.车速不稳上车
[单项选择]I类启动子突变可影响合成（）。
A. 核糖体30S亚基
B. 核糖体40S亚基
C. 核糖体50S亚基
D. 70S核糖体
E. 以上都不对
[判断题]生产过剩、搬运、库存、时间、动作、加工、等待是常见的七大浪费。
A.正确
B.错误
[单选题]悬挑结构是靠压重或外加拉力来保持稳定,要求抗倾覆的安全系数不小于( )
A.1.2
B.1.5
C.1.8
D.2.0
[单选题]消防员请假1日以内的（不离开驻地，不在外住宿）由谁批准？
A.站长（中队长）助理
B.站（中队）副职
C.站（中队）主官
D.大队领导
[单项选择]Samuel Clemens was born on November 30th, 1835. In fact, Mark Twain was his penname and he got it from the call ("Mark twain!"—meaning by the mark of two fathoms) used when people measured (测量) how deep the water was.
Mark Twain was also famous in his day as a public speaker besides a writer. In his public speeches he always told funny stories. He also liked to play jokes on his friends. One day one of his friends lost his wallet and asked Mark Twain to pay his train fare(费用) for him.
"But I don’t have enough money to pay both your fare and mine", Mark Twain said. The friend did not know what to do.
"I’ve got an idea", said Mark Twain. " We can get on the train and when the conductor (列车 员) comes to check the tickets, you can hide under my seat. "
Later, however, when the conductor came to check the tickets, Mark Twain gave him two tickets—one for his friend and the other for himself. Then he explained in a loud voice, "I have a strange friend. When he travels by tr
A. a phone call
B. a call people made when they measured the water
C. a book called Mark Twain
[单项选择]节育器的正常形态，除外（）
A. 圆形
B. 长圆形
C. 扁圆形
D. 纵"一"字形
E. 横"一"字形
[判断题] 民事权利是民事法律规范或确认的民事主体的权利。民事主体实际享有民事权利需要一定的法律依据。
A.正确
B.错误
