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。
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。
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。
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