Some of the machine tools are so small that they can be moved by hand. Others arc so big that they weigh 100 tons or more.
有些机床很小，用手就可以搬动；另外一些则很大，重达100吨或100吨以上。
Two kinds of new special measuring tools for measuring the radius of non entire circle arc are designed.
设计了两种测量非完整圆弧半径的新型专用量具。
The practice proves that by using the two measuring tools could directly measure the non-entire circle-arc radius, and the measuring tools are simply operated and economically used.
实践证明，使用这两种量具可直接测量非完整圆弧半径，量具操作简单经济实用。
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