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.
油气巨头之所以没有明显受益，原因有几个。即便这些公司并不以中东为基地，它们自身也容易因战争而遭受严重扰动。比如，埃克森美孚与卡塔尔能源在液化天然气领域有合作，若扰动持续，将威胁该公司的扩张计划。
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百亿和十亿级别的企业研发投入总和1.76 万亿元，以6.39%的企业总数（378 家），占到全部研发投入的六成（64.94%）。