以下的应力-应变图中哪一个是低碳钢一次拉伸的应力-应变图？【2001-54】

• A.<img src="https://timg.fentiku.com/101/2016/10/21/CcDTR4HaXq.png" title='CcDTR4HaXq.png' alt='CcDTR4HaXq.png'/>
• B.<img src="https://timg.fentiku.com/101/2016/10/21/lBHkaAskt3.png" title='lBHkaAskt3.png' alt='lBHkaAskt3.png'/>
• C.<img src="https://timg.fentiku.com/101/2016/10/21/nvi9gsEQyE.png" title='nvi9gsEQyE.png' alt='nvi9gsEQyE.png'/>
• D.<img src="https://timg.fentiku.com/101/2016/10/21/AkjJdDSpqw.png" title='AkjJdDSpqw.png' alt='AkjJdDSpqw.png'/>

正确答案：B