A、neither
B、either
C、so
D、both
A、neither
B、either
C、so
D、both
A、commercial agent
B、beneficiary
C、salesman
D、broker
A.so far
B.by far
C.thus far
D.as far as
A、at some instant, the accelerations of all points on a line perpendicular to the axis of rotation are not parallel to each other.
B、at some instant, the velocity magnitudes of any two points are proportional to their vertical distances to the axis of rotation.
C、at some instant, the velocities of any two points are parallel to each other.
D、it is impossible that the motion paths of all points are circular arcs.
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