首页
登录
职称英语
[audioFiles]2016m4x/audio_ezfj_394_20164[/audioFiles]Switch开关 An electric s
[audioFiles]2016m4x/audio_ezfj_394_20164[/audioFiles]Switch开关 An electric s
游客
2024-09-19
1
管理
问题
选项
答案
Switch开关
An electric switch is often on a wall near the door of a room. / Two wires lead to the lamp in the room. / The switch is fixed in one of them. / The switch can cause a break in this wire, and then the light goes. / The switch can also join the two parts of the wire again, then we get a light. / Switch can control many different things. / Small switches control lamps and radio sets because these do not take a large current, / larger switches control electric fires. / Other switches can control electric motors. / Good switches move quickly. They have to stop the current suddenly. / If they move slowly, an electric spark appears. / It jumps across the space between the two ends of the wire. / This is unsafe and it heats the switch. / Very big switches are sometimes placed in oil. / Sparks do not easily jump through oil, so the oil makes the switch safer. /
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3765160.html
相关试题推荐
[audioFiles]2016m4x/audio_ezfj_242_20164[/audioFiles]
[audioFiles]2016m4x/audio_ezfj_395_20164[/audioFiles]Typhoon台风Someofthe
[audioFiles]2016m4x/audio_ezfj_394_20164[/audioFiles]Switch开关Anelectrics
[audioFiles]2016m4x/audio_ezfj_393_20164[/audioFiles]Opportunity机会Theair
[audioFiles]2016m4x/audio_ezfj_384_20164[/audioFiles]Elections选举Surprises
[audioFiles]2016m4x/audio_ezfj_383_20164[/audioFiles]EyesCanSpeak眼睛会说话Mu
[audioFiles]2016m4x/audio_ezfj_382_20164[/audioFiles]Seniors老年人Seniors,or
[audioFiles]2016m4s/audio_ezfm_013_20163[/audioFiles]
[audioFiles]2016m4s/audio_ezfm_037_20163[/audioFiles]Histor
[audioFiles]2016m4s/audio_ezfm_009_20163[/audioFiles]
随机试题
[originaltext]AmericanvisitorstoEastAsiaareoftensurprisedandpuzzle
Ahurricane(飓风)isapowerful,rotatingstormthatformsoverwarmoceansn
The1988droughtinNorthAmericawasprobablycausedbyshiftsinthetemperatu
InasurveyconductedbyresearchfirmHarrisInteractive,71%ofAmericans
一座2层二级耐火等级丙类木器厂房(建筑高度H=10m)与一座2层二级耐火等级电子
以下有关机械循环集中热水供应系统管网计算的叙述中,哪几项是错误的?()A.定
甲公司和乙公司签订一份加工合同,甲公司提供价值150万元的原材料并收取加工费20
黄芩具有而黄柏不具有的功效是A.燥湿 B.泻火 C.解毒 D.清肺
饮食行业的标准化是多年来的一个趋势,最大的好处是降低成本和保障安全,这种一致性带
下列哪些情况提交的教育证明.应当同时提交国务院教育行政部门对拟任人所获教育文凭的
最新回复
(
0
)