Itis expounded that the poly-drilling technique is thedeveloping trend of the geodrilling technique of Chinain the future.

Discussion on the reason of influencing coalfield drilling efficiency and its countermeasure

The article also argues about the problem of how to improve drilling efficiency in high elevation area.

A new idea was put forward to increase drilling efficiency and time availability ratio,reduce hole acci- dent,decrease labor intensity in the complex formations.

Analysing comprehensive efficiency and tapping potential of equipments;

A field survey and analysis on the data from water pumps in bottom hole at Jiaoxi coal mine are presented and a variety of factors effeted on the comprehensive efficiency of water pumps are discussed Therefore, some proposals for the reformation and improvement on water pumps have been put forwar

Research on overall efficiency of Chinese port-typed listed companies;

Based on the non-Archimedian infinite model C~2R of the Data Envelopment Analysis,combined with characteristics of Chinese mainland banks inputs and outputs,the paper sets up an index system of inputs and outputs as well as an overall efficiency evaluation model for Chinese banks,which considers not only the profit ability,but also the control capacity of banks risk.