There is no internal scale product of dry screw pump owing to the late research starting, so like products are all depend on importing and the price is very expensive.
由于国内螺杆干泵的研究起步较晚，目前还没有规模化的产品，同类产品全部依靠进口，价格十分昂贵。
In the face of these grim statistics, OPEC decided last month to pump 1.5m fewer barrels a day (about 2% of global consumption), starting from November 1st.
面对这些严峻的数据，石油输出国组织上个月决定，自11月1日起，每天减产150万桶(约占全球消耗量的2%)。
Based on field test and operation, the starting and operating chareteristics of an electric submersible pump(ESP)are analyzed.
根据现场试验和运行情况，分析了电动潜油泵的启动特性和运行特性。
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