韓國(guó)龍聲電機(jī)株式會(huì)社(yongsung electric co;ltd)型號(hào)齊全,，價(jià)格優(yōu)惠：
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led的工作電壓低，采用直流驅(qū)動(dòng)方式,，-功耗單管0.03~0.06w,，電光功率轉(zhuǎn)換接近100%，在相同照明效果下比傳統(tǒng)光源節(jié)能80%以上,。
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蜂鳴器主要分為壓電式蜂鳴器和電磁式蜂鳴器兩種類型,。
2三繞組變壓器：一般用于電力系統(tǒng)區(qū)域變電站中，連接三個(gè)電壓等級(jí),。
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試驗(yàn)變壓器：能產(chǎn)生高壓,，對(duì)電氣設(shè)備進(jìn)行高壓試驗(yàn)。
變壓器由鐵芯或磁芯和線圈組成,，線圈有兩個(gè)或兩個(gè)以上的繞組,，其中接電源的繞組叫初級(jí)線圈，其余的繞組叫次級(jí)線圈,。
互感器分為電壓互感器和電流互感器兩大類,。
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