The design, operating principle and fitting process of hand-operated going up and down mechanism of national flag are introduced in this paper.
介绍了一种国旗手动升降机构的设计、工作原理及装配过程。
The design, operating principle and fitting process of hand-operated going up and down mechanism of national flag are introduced in this paper.
介绍了一种国旗手动升降机构的设计、工作原理及装配过程。
应用推荐