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配电箱(室)进出引线的导线截面,应按导线的载流量确定
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客户对表计准确性提出异议要求校验时,专职电工无向客户声明客户向供电企业提出校验申请的权力和义务
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线圈中感应电动势的方向可用楞次定律来判断。该定律可叙述为:感应电动势的方向总是企图产生感应电流来阻碍原磁通的变化
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万用表是一种比较精密的仪表,应谨慎使用,要注意防振、防潮和防高温。不用时应存放在干燥的地方
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测量电缆绝缘电阻时,一般用绝缘电阻表进行测量。开始时电阻值较小,随着时间延长绝缘电阻阻值增大,这是正常现象
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巡视中发现紧急缺陷时,应立即终止其他设备巡视,在做好防止行人触电的安全措施后,立即上报相关部门进行处理
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电杆装配各部螺栓穿向要求:垂直地面者一律由下方向上方穿入
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在使用射钉枪时,都必须使枪与紧固件保持垂直位置,且紧靠基体
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抄表段信息可以根据现场情况变化随时进行调整
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某非工业用户装10kV100kV·A专用变压器用电,其计量装置在二次侧的,应免收变损电量电费
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电能计量装置不安装在产权分界处时,线路与变压器损耗的有功电量均由产权所有者负担
【判断题】
在负载对称的三相电路中,无论是星形还是三角形连接,当线电压U和线电流I及功率因数已知时,电路的有功功率P=3UIcosφ
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“小面歪”的正杆工作,必须停电作业,将导线和绝缘子之间的绑线拆掉后进行
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变压器的低压负荷电流测量应将钳型电流表转换开关旋转至电流量程
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变压器联结组标号(联结组别)不同时,才可以并联运行
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变压器台安装尺寸必须符合图纸要求,横担等铁件应平整,螺丝应紧固,穿入方向正确,丝扣露出螺帽3~5扣,不得过长或过短
【判断题】
三芯电缆每相屏蔽层都应缠绕接地线并焊接,但可以一根接地线引出
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制作电缆头,在进行热缩时,加热时必须不断地移动火焰位置,不可对着一个位置加热时间过长
【判断题】
电缆排管敷设方法,可以用多根硬塑料管排成一定形式
【判断题】
在电缆施工中发现有异常情况不利电缆线路今后安全运行时,施工人员可以向有关部门提出更改设计
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控制电缆的选用(型号、规格)及配置符合规范规定,其敷设途径应在二次设备正常运行条件下能进行维护工作
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按抄见功率(kW)数计算最大需量时,可直接按每小时抄见功率(kW)数计算最大需量
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降低功率因数标准的用户的实际功率因数,高于或低于降低后的功率因数标准时,都应减收或增收电费
【判断题】
变压器做空载试验时,应在额定电压下进行
【判断题】
若穿过每匝线圈的磁通量相同,则该线圈的磁链与其匝数N成反比,与穿过的磁通量成正比
【判断题】
磁场的强弱使用磁感强度(也叫磁感应强度)来表示,磁感强度大表示磁感强;磁感强度小,表示磁感弱
【判断题】
视在功率就是电路中电压有效值U和电流有效值I以及功率因素的乘积
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所有的巡视工作必须按照规定的巡视周期进行
【判断题】
减少降压变压器二次绕组的匝数,可提高二次侧的输出电压
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金具组装配合应良好,安装前应进行外观检查
【判断题】
全站停电时,应先拉开电容器组断路器后,再拉开各路出线断路器
【判断题】
立杆时侧拉绳可取电杆高度的1.2~1.5倍
【判断题】
电压互感器和电流互感器的工作原理与电力变压器工作原理基本相同
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开启式负荷刀开关的熔丝只有在过负荷时熔断,而短路故障时不熔断
【判断题】
钢管配线时,管身及接线盒需连接成为一个不断的导体,并接地
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用电检查现场发现:某客户私自将电能表的封印拆除,将A相电流进出线反接,其行为是窃电
【判断题】
在电路计算时,先假定电流参考方向,计算结果为正说明电流实际方向与参考方向相同;反之,计算结果为负说明实际方向与参考方向相反
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【单选题】
Q1: How long will the woman spend on her way to and from work by high-speed train?___
A. 4 hours .
B. 2 hours .
C. 1.5 hours .
D. 45 minutes .
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Q2: When does the woman arrive back home by subway?___
A. At 8 .
B. At 7 .
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D. At 5 .
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Q3: According to the woman, in what way will the new high-speed train be a big help to her?___
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Q4: How will the new high-speed train affect the man?___
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Q2: What is the present situation about Americans’ commuting to work?___
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Q3: Why does Steven choose to have an extreme commute?___
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Q2: What is the actual reason that Katy doesn’t want to attend Jason’s party?___
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【单选题】
Q3: What is special about Linda’s party?___
A. The party will last four hours .
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【单选题】
Q4: What will Katy do to solve her problem?___
A. Go to Jason's party .
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C. Attend both Jason's and Linda's parties .
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Q1: What is special about this year’s Black Friday shopping?___
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Q2: Why did some stores open at midnight on Thanksgiving night?___
A. To attract young customers .
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C. To let people sleep late the next day .
D. To keep people stay up for the night .
【单选题】
Q3: How many Black Friday shoppers were reported to go to the shops at midnight this year?___
A. 24 percent .
B. 37 percent .
C. 9.5 percent .
D. 23.5 percent .
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Q4: What can we learn about the 15-year-old Jenny?___
A. She and her cousins went back home at midnight .
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Q1: Why did the woman decide to do a triathlon?___
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Q2: When did the man first do a triathlon?___
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A. Boring.
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【单选题】
Q1: What is the ratio of positive to negative emotions that can make a person happier?___
A. 1:3.
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【单选题】
Q2: What is the most exciting finding about increasing positive emotions?___
A. It improves relationships .
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Q3: What does the speaker say about negative feelings?___
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【单选题】
Q4: What is the main idea of the passage?___
A. People should learn to manage their emotions .
B. People should be patient with their negative feelings .
C. People should learn to analyze causes of unhappiness .
D. People should identify as many positive feelings as possible .
【单选题】
Q1: What are the man and woman talking about?___
A. Whether nature is magical and kind .
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【单选题】
Q2: What can we learn about Christopher?___
A. He made a film about his trip to Alaska .
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【单选题】
Q3: What does the woman think about Christopher taking the trip to Alaska?___
A. He was too foolish .
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【单选题】
Q4: Which of the following is NOT mentioned as something that would have saved Christopher’s life?___
A. A gun to hunt .
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D.
E. mergency communication equipment .
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Q1: What speed can an avalanche reach within five seconds of taking off?___
A. At 8 miles an hour .
B. At 18 miles an hour .
C. At 80 miles an hour .
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【单选题】
Q2: According to the passage, under what circumstances may an avalanche occur?___
A. There are too many layers of snow on the .
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C. The top layer of snow slides off the layer below it .
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【单选题】
Q3: What are skiers advised to do to avoid being caught in an avalanche?___
A. Ski only in the official ski areas .
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【单选题】
Q4: Why does the ski patrol use explosives?___
A. To dig holes in the snow .
B. To close the area for skiing .
C. To make an avalanche move on purpose .
D. To' check how different layers are holding up .
【单选题】
Q1:What is conversation mainly about?___
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Q2:What did the woman do last night?___
A. She bought a new leather coat .
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C. She treated all her friends to dinner .
D. She went to a concert with her friends .
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Q3:Where did the woman get the money?___
A. She just received her student loan .
B. She saved some money for herself .
C. She borrowed the money from her friends .
D. She asked her mom to send her the money .
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Q4:What is the man?___
A. A teacher of biology .
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Q1: What is this passage mainly about?___
A. How businesses can compete with each other .
B. How small businesses operate during holidays .
C. How small businesses manage holiday workers .
D. How can earn more money during holidays .
【单选题】
Q2: According to Rubin, what can small companies do to thank holiday workers?___
A. Have talks with their families .
B. Give them good extra benefits .
C. Offer them expensive holiday tokens .
D. Show appreciation to them face to face .
【单选题】
Q3: What can small business owners do to help holiday workers get into the holiday spirit?___
A. Entertain them with big meals .
B. Let them enjoy some holiday games .
C. Give them handmade thank-you cards .
D. Send their families some holiday gift cards .
【单选题】
Q4: Who are supposed to benefit most from this passage?___
A. Workers who have to work during holidays .
B. Employees who intend to earn extra money .
C. Big companies that usually close on holidays .
D. Small businesses that try to be more competitive .