电子束曝光机版图切割过程中可能出现带内孔的多边形，并且多边形内环与外环之间可能发生重叠。
During the layerout cutting process for thee beam lithography system, some polygons with one or more inner holes may appear.
结果表明带中庭的高层住宅比一般住宅具有通风效果好、人们对室内环境满意度高等优点。
The result indicates that atrium residential building is better than commonly tall residential building in ventilation effect, and the satisfaction degree of indoor environment.
简体中文标题：滚动轴承。单列非自保持径向止推球轴承。带可分解内环的四点支承滚动轴承。
English Name:Rolling bearings - Angular contact radial ball bearings - Part 4: Single row, double-direction - not self-locking, with double-split inner ring (Four-point contact bearing)
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