假日保险的申请与答复英语作文

lone wolf 2024-05-24 02:26:50

最佳回答

an electric switch ** often on a wall near the door of a room. two wires lead to the lamp in the room. the switch ** fixed in one of them. the switch can cause a break in th** 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 h**e 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. th** ** unsafe and it heats the switch. very big switches are sometimes placed in oil, sparks do not easily jump through oil, and so the oil makes the switch safer.a large current makes a wire hot. if the wire ** very thin, even a small current makes it hot. th** happens in an electric lamp. the electric wires in a house are covered with some kind of insulation. no current can flow through the insulation, so the current can never flow straight from one wire to the other, but the insulation on old wires ** often broken, then the copper of the two wires can touch. a large current may flow, and if th** happens, the wires will get very hot. then the house may catch fire. 20210311

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假日保险的申请与答复英语作文

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房贷计算器-九子财经 | 备案号：桂ICP备19010581号-1 商务联系企鹅：2790-680461