化说明：社会主要矛盾随着国际国内政局的变化而变化，阶级矛盾服从于民族矛盾。２．八七会议。南昌起义后六天，中共中央在湖北汉口秘密召开紧急会议，即八七会议。当时，全党迫切需要彻底清算并纠正党在过去的严重错误，决定新的路线和政策。会议旗帜鲜明地清算了大革命后期? Description: The main social contradictions change with the changes in international and internal political situations, and class conflicts are subordinated to ethnic conflicts. 2. August 7th meeting. Six days after the Nanchang Uprising, the CPC Central Committee secretly convened an emergency meeting in Hankou, Hubei Province, which was the August 7th Conference. At that time, the whole party urgently needed to thoroughly liquidate and rectify the party’s serious mistakes in the past and decide on new lines and policies. The conference clearly cleared the late period of the Great Revolution.