单项选择题
There is no obvious change of grain structure during plastic deformation.
A.
Correct
B.
Wrong
点击查看答案&解析
，角速度为
，然后保持其质心位置不变，通过四肢伸开实现展身，使其转动惯量增加为
，则此时她转动的角速度变为( )
A.
B.
C.
D.
