A. at the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
B. the two rigid links have no linear velocities relative to each other at the instantaneous centre
C. the two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
D. the double centre can be denoted either by 02 or Ol2, but proper selection should be made
E. none of the above
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