结合双角钢桁架节点现有的研究成果，包括文中介绍的几种节点计算方法。

Combining with the current study achievement of double-angle truss joint, including several calculating methods which will be introduced in the thesis.

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“完美的柯纳比三角钢琴结合巨大音量、稀有的共鸣、高尚的音质和完美的击弦机功能。”—P。柴可夫斯基，俄罗斯伟大作曲家。

"The beautiful Knabe Grand combines with great volume of tone, rare sympayhetic and noble tone color and perfect action. " --P. Tchaikovsky, great Russian Composer"

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“完美的柯纳比三角钢琴结合巨大音量、稀有的共鸣、高尚的音质和完美的击弦机功能。”—P。柴可夫斯基，俄罗斯伟大作曲家。

"The beautiful Knabe Grand combines with great volume of tone, rare sympayhetic and noble tone color and perfect action. " --P. Tchaikovsky, great Russian Composer"

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