增长的原因,一方面是上市企业新陈代谢,部分退市,以及IPO带来新鲜血液。另一方面是越来越多企业开始投入研发,并主动披露研发相关数据。
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Roud then ventures a theory of his own: the custom, he argues, probably developed from a children’s game called Tig-touch-wood that was popular in early 19th century England.