问题
单项选择题
下列机构的演化形式为曲柄滑块机构的是（）
A.曲柄摇杆机构
B.双曲柄机构
C.双摇杆机构
D.导杆机构
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
下列机构的演化形式为曲柄滑块机构的是（）
A.曲柄摇杆机构
B.双曲柄机构
C.双摇杆机构
D.导杆机构
参考答案：A
Dear Peter, I hope everything is going well with you ! I’m glad __41__ your letter asking for my __42__ on how to learn Chinese well. Here are__43__suggestions. Firstly, you can take part__44__a Chinese course. There you can learn from the teachers and practice with your classmates as possible as you can. Secondly, __45__is important to read some newspapers about__46__and watch Chinese TV programs whenever possible. Besides, it is also a good idea__47__and sing Chinese songs, it can improve your oral Chinese and by__48__so, you’ll learn and remember Chinese words__49__ I think__50__to improve your Chinese is by making more Chinese friends. You can chat and do something__51__them together.__52__you want to learn it, they will tell you a lot about China and help you learn Chinese. I believe you can learn Chinese__53__. Try__54__to me in Chinese next time. Good luck to you! Best__55__! Yours, Li Hua
|