The planar K-type and multiplanar KK-type joints are very commonly used in the directly welded circular hollow section (CHS) structures.

平面K型和空间KK型节点是直接焊接圆钢管结构中普遍使用的一种节点形式。

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The influences of formation condition and draw ratio in melt spinning on the hollowness of Circular cross section hollow polyester fiber are studied.

本文就熔融纺丝成形条件及后拉伸倍数对圆中空聚酯纤维中空度的影响进行了探讨。

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At the same time we can get the relationship between hollow circular laser beam and duty circle at different defocusing cross section.

同时得出了不同离焦量横截面上中空环形光斑的大小和占空比之间的关系。

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