变形抗力是金属和合金抵抗弹性变形的能力。
参考答案：错
_______crime in this area has increased so much over the last 20 years?[ ]
A. Why is it that
B. Why it is that
C. Why was it that
D. Why it was that
体以卧姿游泳身体运动方向如何规定的？
