As a developing country, independent innovation is not its own innovation, more non-closed innovation, and cannot exclude the introduction of technology, but technological innovation capabilities cannot be directly obtained through the introduction, and key technologies are even more difficult to buy. Japan and South Korea introduced technology and digested and absorbed. The ratio of expenses is 1: 5 and 1: 8, while the ratio in China is 1: 0.15. It can be seen that the main problem of technology introduction in China is? ['Insufficient digestion and re-innovation of imported technology.', 'Relying too much on technology introduction and not strong independent innovation ability.', 'Not enough effort to introduce advanced technology.', 'The technology introduced is not the most advanced and critical technology in the world.']