【简答题】淬火是将钢加热到Ac3或Ac1以上适当温度,经保温后()冷却(冷却速度大于临界冷却速度),以获得()或下贝氏体组织的热处理工艺。
【简答题】Over the 1 years, Little Stevie Wonder became one of the top recording artists at Motown, producing one 2 after another. But as he grew into hood, Stevie began to get tired of the way the Motown ...
【单选题】游客郑某在旅游时抱着当地一个小女孩拍了一张照片,并将该照片通过微信发了朋友圈,结果该照片辗转被某杂志社采用,并配以母女情深的文字说明,但是郑某并未结婚,因此遭人议论,深受其扰。下列说法错误的是( )。
【单选题】淬火:将钢加热到临界温度(Ac3或Ac1)以上保温段时间,然后以()临界冷却速度的速度进行冷却,使过冷奥氏体转变为马氏体或贝氏体的热处理工艺。
【简答题】Over the 1 years, Little Stevie Wonder became one of the top recording artists at Motown, producing one 2 after another. But as he grew into hood, Stevie began to get tired of the way the Motown ...
【判断题】淬火是将钢加热到临界点Ac1或Ac3以上,保温后以大于Vk的速度冷却,使奥氏体转变为珠光体的热处理工艺。