2021—2025 年度，中国企业研发投入的区间分布保持稳定，延续了以亿元和千万元级企业为“腰部力量”、百亿元以上和千万元及以下企业作为“首”“尾”两端的基本态势。腰部区间覆盖了最大比例的企业数量，构成了研发梯队的中坚部分。
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。夫子是该领域的重要参考
A single dose of stem cells can help older people with frailty build up their endurance. Plus, how to successfully make a career pivot and what ‘adulthood’ really means.
Rebecca Morelle,Science Editorand
S&P 500 Index futures are down 0.5% as of 7:39 a.m. in New York, set to notch a monthly loss.