研究发现，经济发达的城市效率较高，如四个直辖市均达到DEA有效水平。

The study found that the more economically developed cities, the higher of the efficiency, such as the four municipalities have reached an effective level of DEA.

youdao

研究发现，经济发达的城市效率较高，如四个直辖市均达到DEA有效水平。

The study found that the more economically developed cities, the higher of the efficiency, such as the four municipalities have reached an effective level of DEA.

youdao