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1·The author, centering on the topic of project planning, analyzes the project planning process combined with the practice of the Yuanbaoshan third engineering fourth machine group construction project.

作者结合元宝山三期工程四号机组建设的实践，紧紧围绕项目计划这一主题，研究基于不确定性分析的项目计划过程。

2·The centering accuracy problem is solved by centering of numerical control boring machine and the counterweight balance problem is solved by the fixed counterweight a and adjustable counterweight b.

用数控镗床定心解决了定心精度问题，用固定配重a和可调整配重块B解决了配重平衡问题。

3·Machine Tools; Spline Shafts and Spline Bore Profiles with 4 Splines, Internal Centering, Dimensions.

机床。带4个键的花键轴和花键孔的剖面。内定心。尺寸。

4·The utility model is a fast-positioning and centering edge-bending machine of color-printing plastic composite bags and pertains to color-printing plastic composite bag manufacturing machine.

彩印塑编复合袋定深快速对中折边机是彩印塑编复合袋制造设备。

5·Technical character:This machine can perform the centering and assembling of both flange and web automatically, straightening of flange deformation, welding speed adjustment.

技术特点：本生产线具有翼板与腹板自动对中组立、翼板变形矫正、焊板速度可调等功能。