Briefed in the article are the inner burr formation of and the burring method for the hi-frequency straight welded tube.

简要介绍了高频直缝焊管内毛刺的形成和清除方法。

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The inevitability and feasibility of application of the grouping technique to production bf hi-frequency welded tubes are discussed from both theoretic and practical point of views.

从理论和实践方面论证了成组技术在高频直缝焊管生产中应用的必然性、可行性。

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Between three subtypes of ADHD, brain wave frequency of HI type was the slowest, of the PI type was the fastest(P<0.01).

三个亚型ADHD患儿中HI型脑电频率最慢，PI型频率最快，三个亚型间两两比较差异有非常显著性（P<0.01）。

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The DA-F60 incorporates neodymium magnets and a passive radiator to produce results typically found in high-end Hi-Fi audio systems, including tuned low-frequency reproduction and virtually no distortion even at high volumes.

ENGADGET: Samsung introduces its CES audio hardware, claims a world first