Ball screw using ball movement, so the starting torque is very small, does not appear sliding movement crawling phenomenon, so can ensure accurate micro feed.

滚珠丝杠利用的是滚珠运动，因此启动力矩极小，不会出现滑动运动那样的爬行现象，故而能保证实现精确的微进给。

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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。

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Starting with the current situations of the screw pump lifting, this paper analyzes the adaptability of the screw pump lifting in alkali-surfactant-polymer flooding and poi...

从三元复合驱螺杆泵举升技术现状出发，分析了螺杆泵举升在三元复合驱应用的适应性，给出了螺杆泵举升技术的应用效果。

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With the home side's pack starting to turn the screw, Earls scored Munster's third try in the 47th minute after O'Gara's clever flat pass - although Timoci Nagusa's attempt at a tackle on the winger left a lot to be desired.

BBC: Munster 24-10 Ulster

That's right, starting on Monday you'll be able to say screw you to Cingular or ta ta to T-Mobile and keep rocking your precious RAZR even after you've jumped ship and signed up with a new provider.

ENGADGET: Copyright Office rules that consumers can legally unlock cellphones