疲劳断裂过程经历裂纹形成、扩展和最后断裂三个阶段。
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低碳钢在拉伸应力作用下的（应力应变曲线）变形过程分为弹性变形、屈服塑性变形、均匀塑性变形、不均匀集中塑性变形四个阶段。
A. 对
B. 错
Our company culture is makes us successful in creating a friendly and exciting environment.
A.where
B.how
C.what
D. why
Most people were greatly shocked by the news the IT company had gone bankrupt.
A.what
B.how
C.why
D. that
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