【单选题】
在动力和照明设备平面图上标注图形符号，用来表示设备的【】关系；在图形符号旁标注文字符号，用来说明其性能和特点。___
A. 位置
B. KONG
C. 连接
D. 相互连接
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相关试题
【单选题】
熔断器的额定电流应【】它本身所安装的熔体额定电流。___
A. 不大于
B. 不小于
C. 大于
D. 小于
【单选题】
电杆基础坑深度应符合设计规定。电杆基础坑深度的允许偏差为＋100mm、【】mm。___
A. -100
B. -80
C. -60
D. -50
【单选题】
根据【】确定多电源供电方式。___
A. KONG
B. 电压等级的高低
C. 用电负荷的大小
D. 用电负荷的重要程度
【单选题】
两部制电价把电价分成两部分：一部分是以用户用电容量或需量计算的基本电价；另一部分是用户耗用的电量计算的【】。___
A. 有功电价
B. 无功电价
C. 电度电价
D. 调整电价
【单选题】
在一经合闸即可送电到施工设备的断路器和隔离开关操作把手上，应悬挂【】标示牌。___
A. 禁止合闸，线路有人工作
B. 禁止合闸
C. 禁止合闸，有人工作
D. KONG
【单选题】
刀开关的定期检修期限为每年【】次。___
【单选题】
变压器气体继电器的作用是【】。___
A. 吸收油中水分
B. 吸收油中渣滓
C. 变压器内部故障的保护装置
D. 吸收油中酸化物
【单选题】
电动机采用联轴器传动时，两联轴器应保持【】。___
A. 30°
B. 同一轴线
C. 垂直
D. 平行
【单选题】
容量在【】kW及以上的电动机需装设失压(零压)和欠压(低电压)保护。___
【单选题】
中性点接地系统比不接地系统供电可靠性【】。___
A. KONG
B. 差
C. 相同
D. 无法比较
【单选题】
无间隙氧化锌避雷器的持续运行电压为允许持久地施加在氧化锌避雷器端子间的工频电压【】。___
A. KONG
B. 有效值
C. 最小值
D. 额定值
【单选题】
电杆基础采用卡盘时，安装位置、方向、深度应符合设计要求。深度允许偏差为【】mm。___
【单选题】
违反规定使用一线一地制照明，当用手拔接地线时触电应为【】事故。___
A. 单相触电
B. 两相触电
C. 跨步电压触电
D. 接触电压触电
【单选题】
工作人员在直梯子上作业时，必须登在距梯顶不少于【】m的梯蹬上工作。___
A. 0.4
B. 0.5
C. 1
D. 0.6
【单选题】
抄表的实抄率为【】。___
A. 抄表的全部数量
B. 抄表的全部电量
C. 实抄户数除以应抄户数的百分数
D. 应抄户数除以实抄户数
【单选题】
电力线路设备的定期巡视周期，一般高压线路【】一次，低压线路每周一次。___
【单选题】
采集终端可以实现电能表数据的采集、数据管理、【】以及转发或执行控制命令的设备。___
A. 数据传输
B. 数据双向传输
C. 数据单向传输
D. 数据无线传输
【单选题】
牛皮安全带的静负荷试验周期为【】试验一次。___
【单选题】
三相电动势的相序为U-V-W，称为【】。___
【单选题】
弧垂观测时，连续档在【】档以上，靠近两端及中间各选一档作为观测档。___
【单选题】
《供电营业规则》规定，用户在当地供电企业规定的电网高峰负荷时的功率因数，应达到下列规定：100千伏安及以上高压供电的用户功率因数为【】以上。___
A. 0.80
B. 0.85
C. 0.90
D. KONG
【单选题】
纯电感电路的电压与电流频率相同，电流的相位滞后于外加电压u为【】度。___
A. 90
B. 120
C. 180
D. 30
【单选题】
依据《国家电网公司业扩供电方案编制导则》，建筑面积大于50平方米的住宅用电每户容量宜不小于【】。___
A. 4kW
B. 8kW
C. 10kW
D. 12kW
【单选题】
竖井内的电缆每【】个月至少巡视一次。___
【单选题】
当配电变压器容量在100kVA以上时，配电变压器一次侧熔丝元件按变压器额定电流的【】倍选择。___
A. 1～1.3
B. 1.5～2
C. 2～3
D. 3～4
【单选题】
以变压器容量计算基本电费的用户，其备用变压器(含高压电动机)属热备用状态的或未加封的，如果未用，应【】基本电费。___
A. 不计收
B. 按备用变压器容量计收
C. 按备用变压器容量50%计收
D. 计收
【单选题】
测量500～1000V电气设备或回路的绝缘电阻时，应采用【】V兆欧表。___
A. 380
B. 500
C. 1000
D. 2500
【单选题】
电工除经过专业技术、操作技能和有关规章制度培训外，还必须经【】培训。___
A. 安全技术
B. 电力生产知识
C. 财务管理
D. 企业管理知识
【单选题】
一般情况下拉线与电杆的夹角不应小于【】度。___
【单选题】
对同一电网内的同一电压等级、同一用电类别的用户执行相同的电价【】。___
【单选题】
用户单相用电设备总容量不足【】千瓦的可采用低压220伏供电。但有单台容量超过1千瓦的单相电焊机、换流设备时，用户必须采取有效的技术措施以消除对电能质量的影响，否则应改其他方式供电。___
【单选题】
10kV及以下电力线路的导线弧垂的误差不应超过设计弧垂的【】。___
A. ±7%
B. ±5%
C. ±2.5%
D. ±1%
【单选题】
变压器油主要起【】作用。___
A. 冷却和绝缘
B. 消弧
C. 润滑
D. 支撑
【单选题】
电力系统中以“kWh”作为【】的计量单位。___
A. KONG
B. 电能
C. 电功率
D. 电位
【单选题】
10kV杆上避雷器与被保护设备间的电气距离一般不宜大于【】。___
A. 1.5m
B. KONG
C. 5m
D. 10m
【单选题】
对未装计费【】的临时用电者，应按用电设备容量、使用时间、用电类别计收电费。___
A. 电流表
B. 电压表
C. 功率表
D. 电能表
【单选题】
测量变压器铁心对地的绝缘电阻，应先拆开【】。___
A. 绕组间的引线
B. 铁心接地片
C. 外壳接地线
D. 穿芯螺栓
【单选题】
计算负荷是按【】条件选择电气设备的一个假定的持续负荷，计算负荷产生的热效应和实际变动负荷产生的最大热效应相等。___
【单选题】
当参考点改变时，电路中的电位差是【】。___
A. 变大的
B. 变小的
C. 不变化的
D. KONG
【单选题】
普阀型避雷器的额定电压是指【】。___
A. 所装位置的额定线电压
B. 所装位置的额定相电压
C. 灭弧电压
D. 所装位置的系统电压
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I'm afraid it ______ tomorrow, but who knows?___
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_____________is one of the five working languages at U.N. , which _______ are very proud of.___
A. The Chinese, the Chinese
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Don't forget _________ the window before leaving the room.___
A. to have closed
B. to close
C. having closed
D. closing
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Twenty people were______ wounded in the air crash.___
A. quickly
B. wrongly
C. bitterly
D. seriously
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The top of the Great Wall is ________ for five horses to go side by side.___
A. wide
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Nancy is considered to be _________ the other students in her class.___
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