【多选题】在低碳钢拉伸试验的应力应变图中,一般有( )四个阶段。
【单选题】Don't throw your things everywhere. _____. [ ]
【单选题】—It’s _________ useful dictionary and you can’t throw it away . —Thank you . I didn’t know it before .
【判断题】Farmers throw away their food because of cosmetic requirements.
【多选题】在低碳钢拉伸试验的应力应变图中,一般有( )四个阶段。