一用电器测得其阻值是55Ω,使用时的电流为4A,则其供电线路的电压为()V。 A.1 发布时间:2020-02-25 18:30 │ 来源:www.tikuol.com 题型:单项选择题 问题: 一用电器测得其阻值是55Ω,使用时的电流为4A,则其供电线路的电压为()V。A.100B.110C.200D.220
题型:单项选择题 2004年12月26日上午8时30分,印尼附近海域发生里氏9级海底地震, 引起巨大的海啸。有几十万人遇难,这次灾难后,国际上加强了对海啸预警系统的研究和建设。地震发生时会产生次声波,已知次声波在水中的传播速度是1500m/s。若某次海啸发生的中心位置到最近的陆地距离是3×105m,海浪推进速度是200m/s,求:(1)海啸中心位置产生的次声波到最近陆地所用的时间; (2)海浪从海啸中心位置到最近陆地所用的时间;(3)岸上仪器从接收到地震发出的次声波到海啸巨浪登岸的时间。 查看答案
题型:单项选择题 I used to live selfishly, I should admit. But one moment changed me.I was on my lunch break and had ___ the office to get something to eat. On the way,I __a busker(街头艺人),with a hat in front of him. I had some ___ in my pocket,but I would not give them to him, thinking to myself he would __ use the money to feed his addiction to drugs or alcohol. He___ like that type— young and ragged. ___ what was I going to spend the money on? Only to feed my addiction to Coca-Cola or chocolate! I then ___ I had no right to place myself above ___ just because he was busking.I ___ and dropped all the coins into his __,and he smiled at me. I watched for a while. As ___ as it sounds,I expected something more to come from that moment—a feeling of ___ or satisfaction, for example. But nothing happened. ___ ,I walked off. “It proved to be a waste of __ .”I thought.On my way home at the end of the ___ , I saw the busker again and he was __ .I watched him pick up the hat and walk __ a cafe counter. There he poured the ___ contents into a tin collecting __ an earthquake fundraising(募捐) event. He was busking for charity!Now I donate any ___ I have to charity tins and enjoy the feeling of giving.小题1:A.leftB.cleanedC.preparedD.searched小题2:A.ledB.choseC.sawD.fooled小题3:A.chocolatesB.coinsC.tinsD.drugs小题4:A.almostB.onlyC.ratherD.still小题5:A.actedB.lookedC.soundedD.smelt小题6:A.ThoughB.ForC.ThereforeD.But小题7:A.declaredB.realizedC.expectedD.guessed小题8:A.itB.allC.himD.them小题9:A.waitedB.followedC.stoppedD.arrived小题10:A.ragB.hatC.pocketD.counter小题11:A.selfishB.awkwardC.innocentD.special小题12:A.happinessB.sadnessC.loveD.hate小题13:A.DisappointedlyB.UnfortunatelyC.CoincidentallyD.Comfortably小题14:A.wordsB.effortC.spaceD.money小题15:A.momentB.dayC.breakD.event小题16:A.walking aroundB.passing byC.packing upD.running off小题17:A.aroundB.inC.behindD.to小题18:A.chiefB.basicC.actualD.total小题19:A.byB.forC.onD.with小题20:A.workB.timeC.energyD.change 查看答案
题型:单项选择题 建设工程数据库对建设工程目标确定的作用,在很大程度上取决于数据库中( )。A.与拟建工程相似的同类工程的数量B.与拟建工程相似的同类工程的数据来源C.已确定的数据库的结构和内容D.已确定的数据库的建立时间 查看答案
题型:单项选择题 某大型化工企业有员工 9700人,2005年企业的总产值是13亿元,2005年发生各类事故22起,全年因事故造成的经济损失达到127.8万元。 该企业2006年发生的第一次伤亡事故造成的直接经济损失是26.7万元,因停产、减产损失的价值是14.5万元,工作损失的价值是2.3万元,资源损失价值是5.2万元。该企业制定了如下安全管理制度:安全生产责任制、安全生产教育培训制度、安全生产检查制度、防爆设备安全管理制度、危险化学品管理制度、重大危险源管理制度。 根据以上情形回答下列问题,1~4题为单选题,只有一个正确的答案,5题为多选题,有两个或两个以上的正确答案。该企业制定的安全生产管理制度还缺少( )。A.防火防爆安全管理制度B.安全操作规程等C.安全防护用品管理制度D.特种设备管理制度E.职工医疗保险制度 查看答案