1) right angle gauge
直角规
2) cylindrical square
圆柱直角规
3) optical square
光直角规，直角转光器
4) three four five rule
三四五直角规约
5) Precision flat try square
平行直角定规
6) right angle
直角
1.
Analyzing on being right angle of space plane angles projection;
投影成直角的空间平面角再分析
2.
The metal of the right angle isnt enough used of hot rolled equal and unequal angle steel Mean while,the right angle is easy producing stress concentration and difficult rolling Therefore,the section of angle steel was optimized,and a new section of round arc angle steel is put forward,which can be easily rolled,used and saved metal material over 5
热轧等边、不等边角钢直角处金属未被充分利用 ,易产生应力集中 ,且轧制难度大 ,因而对其断面进行了优化设计 ,提出一种新型圆弧角钢 ,其轧制容易 ,使用方便 ,可节约金属材料 5 %以
补充资料：三四五
1.三十四﹑五之略语。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
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