CORC

浏览/检索结果: 共2条,第1-2条 帮助

限定条件        
已选(0)清除 条数/页:   排序方式:
Hydraulic multi-variable valve driving system, has shell provided with oil drainage port and driving port, phase adjusting mechanism for adjusting phase of camshaft, and oil inlet valve whose connecting end is located at driving port. 专利
申请日期: 2018-01-01, 公开日期: 2018-05-29
作者:  CUI J LONG W WANG Y
收藏  |  浏览/下载:6/0  |  提交时间:2019/12/02
Mine rock drilling anti-reflection type gas plugging and drainage extraction method involves drilling coal seams to top or bottom plate rock body at set angle, connecting test probe, and pushing to designated pumping area. 专利
申请日期: 2018-01-01, 公开日期: 2018-03-06
作者:  LIANG Z SONG W ZHAO C MA T MA K QIA
收藏  |  浏览/下载:4/0  |  提交时间:2019/12/02


©版权所有 ©2017 CSpace - Powered by CSpace