Italy claim historic first victory over England as Borthwick’s men are rattled in Rome

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The first harmonic is the string vibrating along its entire length, otherwise known as the fundamental frequency. When we say that your C string is vibrating at 1 Hz, that really means that its fundamental has a frequency of 1 Hz. The other harmonics all have other frequencies, and we’ll get to those, but the fundamental is usually the loudest harmonic, and it’s usually the only one you’re aware of hearing.

伊朗称美国袭击“德纳

Фото: Максим Блинов / РИА Новости。91吃瓜对此有专业解读

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关键词:伊朗称美国袭击“德纳16版

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胡波,专栏作家,多年从业经验,致力于为读者提供专业、客观的行业解读。