We used to measure the square basing on national standards standing order, or with the Certificate of Square, or with light gap method.
直角尺垂直度的检定一般依据国家规程进行,或用直角尺检定仪检定,在缺乏直角尺检定仪的情况下采用光隙法。
A Method for Accuracy Test and Repair of Big-size Square Rulers;
一种大尺寸直角尺的精度检测与修复方法
the carpenter who built this room must have lost his square.
建这座房子的人一定丢了他的直角尺。
Discussion of "Squares" Verification Regulation
对JJG7-2004《直角尺》检定规程部分内容的几点商榷
The steel square is used for laying out and trying up right angles.
钢尺用于设计并精确修整直角。
A Study on Angle Measurement of Non-uniplanar Lines in Large-scale Space;
大尺寸空间异面直线夹角测量的研究
a square having a metal ruler set at right angles to another straight piece.
有一根金属尺子安装在另一根之上成直角的直尺。
The upper-left corner of the workspace, where the horizontal and vertical rulers intersect.
工作区域的左上角，垂直标尺和水平标尺在此相交。
(3) The clearness of the steel balls was related with the tilt angle of ruler. A great tilt angle resulted in blurring of the steel balls.
(3)直尺上钢珠的清晰度与直尺的倾斜角度有关 ,倾角过大即可产生模糊。
Design and Application of Spread Rectangular Drawing Rule in Topographic Survey;
地形测量普及型直角坐标展点尺的设计与应用
A straightedged strip, as of wood or metal, for drawing straight lines and measuring lengths.
尺，直尺，划线用木头或金属等制成的直角的条，用于划直线和测量长度
An exaggerated vertical scale is useful, however, when dealing with low dips and subdued topography.
但在倾角小，地形平缓的情况下，放大垂直比例尺是有用的。
A Right Method for Determining the Minimum Size of a Disc Cam with a Translating Follower by Allowing Pressure Angle
按许用压力角确定直动推杆盘形凸轮机构最小尺寸的正确解法
a drawing board and a ruler mounted on a tripod; used to sight and map topographical details.
一个制图板和在一个三角架上装好的直尺；用来观察和绘制地图学上的细节。
He fell sheer down 300 feet.
他垂直跌下了三百英尺。
I have got a ruler. Will that do ?
我有一把直尺。 能行吗？
Pen and pen-cil, ru-ler, book, ru-ler, book
钢笔和铅笔，直尺和书本。
Willis bite gauge
威利斯垂直距离测量尺
quick look scaler
快速直观解释比例尺