The cylinder chain lower super long stroke pumping unit is a kind of up to date and high efficiency equipment.

圆柱链低矮式超长冲程抽油机是一种新型高效有杆采油设备。

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The cylinder chain lower super long stroke pumping unit is a kind of up to date and high efficiency equipment.

圆柱链低矮式超长冲程抽油机是一种新型高效有杆采油设备。

youdao