This thesis includes four parts, which can be classified into two pieces: theory piece and construction piece.

文章内容分为四部分，也可简单的归结为两篇：理论篇和建设篇。

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Single row angular contact ball bearing with two piece inner ring has complex construction, long design cycle, great difficulty in processing.

双半内圈四点接触球轴承结构复杂、设计周期长、加工难度大。

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Explain the differences between two-dimensional (flat) shapes and three-dimensional (solid) shapes. How are the book and piece of construction paper the same?

解释二维(平面)图形和三维(立体)图形的不同：书和美术纸有什么相同之处？

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Explain the differences between two-dimensional (flat) shapes and three-dimensional (solid) shapes. How are the book and piece of construction paper the same?

解释二维(平面)图形和三维(立体)图形的不同：书和美术纸有什么相同之处？

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