Seamless long steel tubes are manufactured by rolling, drawing and ___

1.	Seamless long steel tubes are manufactured by rolling, drawing and __________.
A.	Extrusion & Tube piercing.
B.	Tube piercing.
C.	Steel & Tube piercing.
D.	None of these
Answer» B. Tube piercing.

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Seamless long steel tubes are manufactured by rolling, drawing and __________.

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