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Seamless pipe is made | |
A. | from rolled strips formed into cylinders and seam-welded. [Wrong Answer] |
B. | by extrusion & casting into static and centrifugal molds. [Wrong Answer] |
C. | by forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing. [Wrong Answer] |
D. | both (b) and (c). [Correct Answer] |