The levying scope covers all light weight oils, excluding gasoline, diesel, kerosene and solvent oil.
征收范围包括除汽油、柴油、煤油、溶剂油以外的各种轻质油。
Simple in structure, small in volume, light in weight, little in energy loss, screw pump oil system could decrease oil cost, improve efficiency, and be of widely prospect.
螺杆泵采油系统结构简单、体积小、重量轻、耗能小，使用螺杆泵采油可降低采油成本，提高采油效益，具有广泛的发展前景。
The structure of oil cooler has the advantage of small size, light weight, heat dissipation area, and high cooling efficiency.
该结构油冷器的优点在于体积小，重量轻，散热面积大，散热效率高。
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