问题
判断题
淬火是指加热到相变温度以上,保持一段时间,后快速冷却。目的是得到较硬的相组织。
答案
参考答案:对
淬火是指加热到相变温度以上,保持一段时间,后快速冷却。目的是得到较硬的相组织。
参考答案:对
选择合适的词组,向大家介绍上周香山秋游的感受。做出准确生动的描述。 | |
2. We _____ last week. So we went to the Fragrant Hills. 3. I couldn’t wait _____ the coach when we arrived. 4. I _____ of the maple leaves. I will show them to yu when they come out. 5. We really _____ that day. Maybe I’ll go there next autumn. |