改正数方程和改正数分布图不仅为使用历史海图的科技人员提供了基础性资料，而且为历史海图深度基准面转换的研究提供了一种新的方法。
The correction equations and scatter diagrams not only provide basic data for technologists who use the historical chart, but also provide a new method f...
原回转铣夹具制造精度较低，现在增加一处工艺基准面，大大提高了它的制造精度和可靠性，并为夹具的使用提供了一处校对基准面，使得叶片型面铣加工更为可靠。
In order to improve the manufacturing technology of rotary milling jigs, a datum plane was added so as to raise the manufacturing precision and reliability.
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