A minute exposition of portable retractable guide ruler in its design conception, design drawing, whole structure, material selection, manufacture technology and advantages is fully comprehensioned.
详细阐述了便携式可伸缩校导尺的设计构思并给出其设计图样，介绍了该设计的整体结构、材料选用、制作工艺及优势。
A minute exposition of portable retractable guide ruler in its design conception, design drawing, whole structure, material selection, manufacture technology and advantages is fully comprehensioned.
详细阐述了便携式可伸缩校导尺的设计构思并给出其设计图样，介绍了该设计的整体结构、材料选用、制作工艺及优势。
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