What theoretical achievements did the Communist Party of China (CPC) people make in socialist construction during their early exploration from 1956 to 1957?
(1) put forward the "second combination" of Marxism and China, which provided basic guiding principles for exploring the road of socialist construction suitable for China. (2) Put forward the slogan of "March into modern science", formulated the long-term planning outline for the development of science and technology, and began to March into the advanced level of world science and technology.