Distortion Phenomenon Analysis of 3m Ruler Used in the Test of Hot Surface Smooth
3m直尺用于熱鋪層平整度檢測時的熱變形現象分析
The teacher came in and a ruler was in his hand.
老師走進教室，手里拿著一把直尺。
Take out a ruler draw a line.
拿出直尺，畫條線；
Proportional servo valve, grid ruler and CNC machine tool
伺服比例閥、光柵直尺與數控機床
At breast height, measure the trunk diameter by a ruler.
在胸部高度的位置，用一把直尺量度干徑。