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在讨论形位误差检测基准建立的一般原则基础上，具体分析讨论；大尺寸机件位置误差检测中基准误差的来源；延伸公差带的传递特点；基准选择建立时容易疏忽而造成不良后果的几个问题。
On the basis of discussing the general principles of the establishment of the basis position error detection standard, the concrete analysis and discussion; the source of the reference error in the detection of large-size machine position error; the transmission characteristics of the extension tolerance zone; A question.