💡 k: 数据范围, d: 最大位数, n: 数据量
In total, directors generally spend between one and three hours a week on activities relating to their position on the Board of Directors.
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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%）。
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