在古代,我们的职业叫什么?连一连,左侧是现代职业,右侧是古代职业
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马车的基本结构包括以下哪些部分?
A. 辀
B. 衡
C. 舆
D. 盖
用下列方框中所给的词和短语填空,并根据需要改变形式。2. _________you follow the news every day, you won’t lose touch with the time.3.There is _________when all the staff members of the company join in the morning run.4. Our team is working on _________of safer skateboards.5. The Mozi Satellite ( 墨子号卫星 ) is another success of _________.6. Now, a _________computer can work out all the data in a very short time.
低碳调质钢中加入了Mn,V,Cr,Nb等多种合金元素,其作用是__________和_____________.
A. 提高淬透性
B. 避免淬硬组织出现
C. 提高回火稳定性
D. 提高塑性和韧性