W. T. ratio and an analysis of the conditions for the said crack development.

分析了顶头工作锥纵裂的条件。

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Growth of the crack have an intently relations of the structure development.

裂缝的发育与构造的关系较大。

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Growth of the crack have an intently relations of the structure development.

裂缝的发育与构造的关系较大。

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