平均单位摩擦力基本上取决于切断压力焊接桥和克服耕犁阻力。
The mean unit force of friction to a great degree depends on shearing of pressure welding bridges and conquering of ploughing resistance.
总的来说，关井会严重地影响气矿和用气单位的生产，如果专门为获得平均地层压力而关井，其代价太大。
At all events, shut-in of gas Wells would seriously affect the producer and the consumer, and it would mean too high a cost just for taking the average formation pressure.
测量出水管断面水流压力和三维流速分布，分析常规方法测定断面水流能量误差较大的原因，提出利用五孔探针准确测定断面水流全压分布、积分平均计算断面单位能量的方法。
Pressure and 3-dimensional velocity distributions in the pipe section are measured. The causes of Lange measuring errors of section flow energy in the outlet pipe by conventional method are analyzed.
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