G-type screw pump according to turn to engage the positive displacement of the new type of pump work, screw pump originated in the early 1980s. Early in the oil field has been widely used, and a
Very large. 1 Analysis of the current situation of traditional reserved hole hole retention method For a long time, we have used the wooden mold to set the reserved hole in the equi
Wedge Anchor Very large. 1 Analysis of the current situation of
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