任何计算定轴轮系的传动比?
参考答案:
定轴轮系的总转动比等于组成该轮系的各对齿轮副转动比的连乘积,也等于轮系中所有从动轮齿数的连乘积与所有主动轮齿数连乘积之比。
根据首字母或汉语提示补全单词,使句意完整。
1.We usually have lunch in our d_________ (餐厅).
2.Is there a l_____ (图书馆) in your school?
3.Tom is taller than me, he sits b ______ me.
4.--- Where is the ______(体育馆)?
--- It's in front of our school library.
5.--- Are there any science l______ (实验室)in the teaching building?
清代男子便帽多采用什么样式?