(1) The socialist public ownership economy has become the main body of the national economy. (2 points) (2) The Eighth National Congress correctly analyzed the situation, pointed out the main contradictions and tasks in China, and put forward the general task of construction and the policy of economic construction; 1960 put forward the "eight-character policy" of economic construction. (4 points, if you can answer the relevant content in detail, you will be given the same score. (3) Implementing the household contract responsibility system in rural areas; Expand the autonomy of urban enterprises, implement a management system in which multiple ownership economies coexist, and implement macro-control with indirect management as the mainstay; Establish special economic zones and open to the outside world; Put forward the basic line of socialist construction and strive to build a socialist market economic system. (4 points)
(1) As can be seen from the information in the materials, such as 1956, the socialist transformation has been basically completed, and the socialist public ownership is absolutely dominant. (2) Note that the "period of building socialism in an all-round way" in the title is from 1956 to 1966, and what is required at the same time is "successful" exploration in the economic field.
(3) This problem requires not only material 2, but also knowledge.