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 variation of the CG location and the support polygon of the platform during level shifting: (a) all legs are in contact and the trunk is inclined, (b) all legs are in contact and the trunk is horizontal, (c) three legs are in contact and the trunk is inclined, and (d) three legs are in contact and the trunk is horizontal.
