电业工人在架设输电线路时,夏天通常会将电线（铝、铜等）架设得稍松一点,为什么?

某地区为减轻农民负担,将农村电价下调了20%,但又为了不减少电业部门的收入,将城镇的电价提高了10%,这时农村和城镇电价正好相等,原城镇电价为0.4元每千瓦时,求原农村电价

电气设备的安全距离
电业安全工作规程中有两个关于安全距离的表——表1：设备不停电时的安全距离；表2：工作人员工作中正常活动范围与带电设备的安全距离.
请问我该如何理解这两个距离的含义?这两种距离都适用于什么场合?

用电压表测得电路端电业为0V,这说明A外电路断路B外电路短路C外电路上电流比较小D电源内电阻为0
题目写错了.应该是用电压表测得电路端电压

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某地区为减轻农民负担,将农村电价下调了20%,但又为了不减少电业部门的收入,将城镇的电价提高了10%,这时农村和城镇电价正好相等,原城镇电价为0.4元每千瓦时,求原农村电价＝

高空作业的电业工人,在操作过程中,不慎将一螺母脱落,经2s螺母落地,取g＝10m/s2,
1.求螺母脱落处距地面的高度 2.螺母落地时的速度大小.（解答要写出文字说明,方程式和重要演算步骤,答案中必须写出数值和单位.）

英语翻译
中文：福建位于中国东南沿海地区,地形多山区,年雷暴日高,架空线路在山区间极易受云层放电活动的影响.本人所在市电业局送电部（主要维护35－220kV输电线路37条）所辖输电线路由于所经地区的地形、地貌、雷电活动情况（包括气候条件）以及线路自身的防雷设计和绝缘水平不同,雷击引起的故障率有很大的差别.在运行过程中承受工作电压、操作过电压或大气过电压时,都可能发生绝缘闪络与雷击跳闸事故,每年发生因雷击引起线路调闸次数均在15至20之间,这对电网的安全与稳定运行构成了较大的威协,并且造成了较大的经济损失.目前针对于土壤电阻率与雷暴日高的地区主要采取架设耦合地线、减少地线保护角、改造接地装置、安装线路避雷器等措施来减少雷击跳闸率.本文主要根据现的技术规程及资料对架空线路的防雷与接地的原理、技术方面进行论述,其主要内容为雷电产生及放电过程、送电线路的防雷保护、防雷装置、接地电阻及运行维护.
google翻译：Fujian is located in southeast coastal areas,more mountainous terrain,high annual thunderstorm days,overhead lines in the mountains between the discharge of highly vulnerable to the impact of clouds.Transmission Power Supply Bureau,which I Department (mainly maintenance of 35-220kV transmission line 37) under the jurisdiction of the transmission line by the topography of the area,landscape,lightning activity (including weather conditions),and line their own lightning protection design and insulation different levels,the failure rate caused by lightning is very different.During operation under voltage,over voltage or air operation over voltage,insulation flashover can occur with lightning trip accidents caused by lightning strikes occur each year due to the number of line transfer gate between 15 and 20 are in this grid security and constitute a large and stable operation of Granville Co,and resulted in greater economic losses.Present for the soil resistivity and thunderstorms mainly in areas of high ground to set up the coupling and reduce angle of ground protection,reconstruction grounding device,install the line arrester and other measures to reduce the rate of lightning trip.This article is mainly based on technical regulations and information on the overhead line lightning protection and grounding principles,technical aspects discussed,the main content generation and discharge of lightning,lightning protection of transmission lines,lightning protection devices,grounding resistance and operation and maintenance.