刚体的转动惯量和与（）有关。它是描述（）的物理量。
参考答案：刚体的质量分布及转轴位置；刚体转动中惯性大小
根据容屑槽方向的不同丝锥可分？
What may be the oldest fossil footprint yet found was discovered in June 1968 by William J. Meister, a non-professional fossil collector.
A．a part-time
B．a spare-time
C．an untrained
D．an amateur
