The optimal design model of downhole pump depth and rod string assemblage is set up.
建立下泵深度和抽油杆柱组合优化设计模型。
The utility model relates to a press type gear shift rod head with a lockset.
一种具有锁具的按压式排档杆头。
The utility model relates to a driving device with a screw rod.
本实用新型涉及一种丝杠传动装置。
The utility model relates to a driving device with a screw rod.
本实用新型涉及一种丝杠传动装置。
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