Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The influence of the upper width error on the spindle azimuth angle of the polygonal cross-section beam and convex cross-section beam; (a) shows the relationship between spindle azimuth angle variation and upper width error; (b) shows the range of variation—the value is the difference between the maximum and minimum values of each line.
