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1)rectangular resolution,Ö±½Ç·Ö½â·¨

2)resolution,rectangular,Ö±½Ç·Ö½â·¨

3)right angle,Ö±½Ç

4)vertical angle,Ö±½Ç

5)perpendicular angle,Ö±½Ç

6)a right angle,Ö±½Ç

7)perpendicular,Ö±½Ç

8)right-angle,Ö±½Ç

9)elbow bend,Ö±½ÇÖâ¹Ü;Ö±½ÇÍä

10)optical square,Ö±½ÇÒÇ,Ö±½Ç (ת¹â)

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Analyzing on being right angle of space plane angles projection;

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The metal of the right angle isn¬ðt 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

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