R&D两面性、外部技术机会与行业间R&D关系——基于中国工业行业数据的实证分析
R&D량면성、외부기술궤회여행업간R&D관계——기우중국공업행업수거적실증분석
Duplicity of R&D, outside technological opportunity and the R&D relationship between industries An empirical study based on the panel data of industries in China