论文部分内容阅读
这种带小轮的尺子能精确测出长度面积和容积尺约有90克重,它的数字系统存贮了能扩大或缩小平面图42种尺度,而且能用特殊的比例编程。
This small wheel ruler can accurately measure the length of the area and volumetric foot about 90 grams, its digital system can store 42 kinds of scales can be enlarged or reduced plan, and can be programmed with a special ratio.