return control oil 回路控制油
Control Risks, a London-based consultancy, thinks it could take three years for oil production to return to normal.
伦敦咨询公司Control Risks则认为要恢复正常石油产量需要3年的时间。
Open system is the pump suction from the tank, the oil through a variety of control valves, the drive hydraulic actuators, valve oil return back for another fuel tank.
开式系统是指液压泵从油箱吸油，油经各种控制阀后，驱动液压执行元件，回油再经过换向阀回油箱。
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