adj. 〔电子〕超声的
n. 超声波的频率大于500MHz

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Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到听力原文收集区，您将会获得10到30积分的奖励! Thank you！

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Panasonic is a Japanese multinational corporation that produces electronics. It is Japans largest maker of electrical goods and the 89th biggest company in the world. The company was founded in 1918 by Konosuke Matsushita. It was called Matsushita De

发表于:2019-01-01 / 阅读(119) / 评论(0)

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发表于:2019-01-11 / 阅读(239) / 评论(0)

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