Therefore,it is still at the elementary stage of transformationing from traditional education to open education.

The privately-owned economy in Suzhou is still at its initial stage of development, and is hampered by such factors as the hysteresis of concepts, insufficient number of privately-owned enterprises, the difficulty to be in the trade and the imperfection of the system and organization.

Action of cavities in different development phases in fractured-vuggy carbonate reservoir;

Based on analysis of the difficulties of water injection methods during different development stages in Daqing oilfield,this paper discusses successive improvement,perfection,and the important role of mechanical water injection technology in adjusting water injection profile.