缺少相应的监测和评价制度，因而不能确定政策和规章制度对采购体系效率和效性有何影响。
A lack of monitoring and evaluation tools to determine the impact of policies and regulations on the efficiency and effectiveness of the procurement system.
油田注水开发整体受效明显，但受井网、储层非均质性、裂缝等因素影响，油井受效率和受效程度有待进一步提高。
The overall efficiency of water flooding is influenced by the well pattern, reservoir heterogeneity, fractures and other factors, and the efficiency and effectiveness have to be further improved.
油田注水开发整体受效明显，但受井网、储层非均质性、裂缝等因素影响，油井受效率和受效程度有待进一步提高。
The overall efficiency of water flooding is influenced by the well pattern, reservoir heterogeneity, fractures and other factors, and the efficiency and effectiveness have to be further improved.
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