构件或物体在外力作用下产生变形,外力除去后能完全恢复其原有的形状,不遗留外力作用的任何痕迹,这种变形称为()。
A.塑性变形
B.弹性变形
C.无要求
参考答案:B
在同一个圆内,半径的长度是直径的一半.______.
—Why did you vote for Maggie?
—Because she is very ______. She always shares things with others. [ ]
A. practical
B. active
C. generous
D. energetic