欧盟入会标准（Copenhagen Criteria）有哪些？

The Copenhagen Criteria is as follows:
To join the EU, a new Member State must meet three criteria:

political: stability of institutions guaranteeing democracy, the rule of law, human rights and respect for and protection of minorities;
economic: existence of a functioning market economy and the capacity to cope with competitive pressure and market forces within the Union;
acceptance of the Community acquis: ability to take on the obligations of membership, including adherence to the aims of political, economic and monetary union.
For the European Council to decide to open negotiations, the political criterion must be satisfied.

Any country that wishes to join the Union must meet the accession criteria. The pre-accession strategy and accession negotiations provide the necessary framework and instruments.