触电事故发生的原因?
参考答案:设备、线路不合格造成漏电,通常是过电压击穿、受潮、受腐蚀温度过高和内部过载,绝缘老化及架空、进户线路安装不合格,安全距离不够,未按规定接地,接零或接错等。维修不善,检修不及时,设备线路存在事故隐患,未能及时发现和整改。违反操作规程,缺乏电气安全知识,未经教育培训、考核就上岗操作,自然因素造成的触电事故,如冰雹、大风造成架空线路,断落造成的触电事故。
触电事故发生的原因?
参考答案:设备、线路不合格造成漏电,通常是过电压击穿、受潮、受腐蚀温度过高和内部过载,绝缘老化及架空、进户线路安装不合格,安全距离不够,未按规定接地,接零或接错等。维修不善,检修不及时,设备线路存在事故隐患,未能及时发现和整改。违反操作规程,缺乏电气安全知识,未经教育培训、考核就上岗操作,自然因素造成的触电事故,如冰雹、大风造成架空线路,断落造成的触电事故。
Each nation has many volunteers(志愿者) who help to take care of others. They books to the people in hospitals or homes for the aged. Sometimes they just visit them and play games with them or listen to their .
Other young volunteers go and work in the homes of people who are sick or . They paint, clean up, their houses or do their shopping.
For boys who no longer have , there is an organization called Big Brothers. College students and other men take these boys to baseball games or fishing places and help them to get to know things that boys learn from their fathers.
Each city has a number of clubs boys and girls can go to play games or learn crafts (工艺). Some of these clubs organize short trips to the mountains, beaches, or other places of interest . Most of these clubs use high school and college students as volunteers because they are young enough to the names of boys and girls.
Volunteers believe that the happiest people in the world are those who help to i happiness to others.
小题1: | A.sell B.read C.throw D.show |
小题2: | A.voices B.speeches C.songs D.problems |
小题3: | A.young B.happy C.old D.hungry |
小题4: | A.pollute B.repair C.build D.remove |
小题5: | A.brothers B.sisters C.fathers D.mothers |
小题6: | A.usually B.never C.only D.seldom |
小题7: | A.which B.who C.when D.where |
小题8: | A.nearby B.faraway C.abroad D.home |
小题9: | A.report B.forget C.remember D.choose |
小题10: | A.cause B.bring C.take D.lend |