单项选择题
A.拉断，弯曲，扭转 B.拉断，弯曲，挤压 C.拉断，扭转，挤压 D.拉断，扭转，变形
A.5% B.6% C.7% D.8%
A.8% B.5% C.10% D.15%
A.20% B.25% C.15% D.10%
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