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The fifth harmonic is the one you get from the string vibrating in fifths. Its frequency is 5 Hz, and it produces a note called E. The interval between C and E is called a major third, which is another name that has nothing to do with harmonics.，详情可参考WhatsApp網頁版
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「物价水平堪比土耳其」塞浦路斯成俄罗斯游客最易抵达的欧洲度假胜地？入境指南详解2023年5月7日，这一点在钉钉下载中也有详细论述
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