principal, which is preserved in perpetuity.
从研发投入规模区间分布情况看，中国已经形成一个由头部企业主导、庞大腰部力量支撑、众多小微企业补充的多层次协作的创新生态。
。关于这个话题，WPS官方版本下载提供了深入分析
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