To raise the success rate of opening and closing the two-stage cementing tool, Model dsg-a cementing tool is developed.
为提高现有双级注水泥器打开和关闭的成功率，研制了DSG—A型系列双级注水泥器。
To raise the success rate of opening and closing the two-stage cementing tool, Model dsg-a cementing tool is developed.
为提高现有双级注水泥器打开和关闭的成功率，研制了DSG—A型系列双级注水泥器。
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