Wang Xiuying, Engineering Plot, Beijing, Science and Technology Press, 21 Century University Course Materials, P169

王秀英，工程制图，北京，科学技术出版社，21世纪高校教材，P169。

youdao

Wang Xiuying, Engineering Plot, Beijing, Science and Technology Press, 21 Century University Course Materials, P169

王秀英，工程制图，北京，科学技术出版社，21世纪高校教材，P169。

youdao