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当测量零件的外形轮廓,如管类的壁厚时,若缺少专用测量工具,可采用图示的球头千分尺,不仅测量准确迅速,而且操作也相当方便。
When measuring the contour of the part, such as the wall thickness of the pipe, the ball-point micrometer shown in the figure can be used if it is lack of special measuring tools, not only the measurement is quick and accurate, but also the operation is very convenient.