- pumping unit
- 2016-11-03 05:20
- With the development of energy-saving oil-pumping unit, people pay more attention to its integrated indicators, which in
- Jilin City Jirui Petroleum Machinery Co.,Ltd
- 2016-10-25 09:31
- oil drilling machine is undoubtedly the key to the whole system, so their study conducted in three areas, namely the dyn