The working principle, principal block diagram, and the detecting records of the three-phase power converter are also analysed in this article.

本文还对三相功率变换器的工作原理、原理框图以及检测数据进行了分析。

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Calculation methods to determine the mass of polygonal and non-regular form steel plate are introduced and a principal block diagram for oil tank bottom plate mass calculation is listed in this paper.

介绍了多边形钢板与不规则多边形钢板质量的计算方法，列出了用计算机计算油罐底板质量的原理框图。

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Thus the research on stress trait, design calculation theory and construction principal point of block retaining structure has certain significance in theory and practical engineering.

因此对砌块式挡土结构的受力特点、设计计算理论及施工要点进行理论分析及试验研究，具有一定的理论与工程实际意义。

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Ford was the principal stumbling block to KORUS ratification.

FORBES: Can the Korea Free-Trade Deal Pass Congress?

And what seems to me and other members of the administration to be the principal stumbling block is the commitment, the die-hard commitment on behalf of congressional Republicans, to even consider asking millionaires and billionaires to pay a little bit more to deal with our deficit challenges.

WHITEHOUSE: Press Briefing by Deputy Press Secretary Josh Earnest

U-turn in America's determination to block it from any Caspian pipeline deal: Iran aspires, not unreasonably, to be one of the principal corridors bringing Caspian oil and gas to market.

ECONOMIST: The Iranian opportunity