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1 地震声光报警器的原理1.1 制作背景地震是一种可怕的自然灾害 ,它经常发生在人们熟睡的深夜 ,使人防不胜防。这里介绍一种适合教学和家庭使用的地震声光报警器。当地震发生时 ,它会发出响亮的警笛和照明灯光 ,使人们尽快转移到安全地方去。通常地震会产生两种波 ,一种是纵
1 Principles of earthquake sound and light alarms 1.1 Making backgrounds Earthquakes are a terrible natural disaster. They often occur late in the night when people are asleep and make it difficult for people to prevent them. Here is an earthquake sound and light alarm suitable for teaching and home use. When an earthquake occurs, it emits a loud siren and lighting lights that allow people to move to safe places as soon as possible. Usually the earthquake will produce two waves, one is vertical