Oxygen cylinders used for autogenous (cutting/welding) purposes are __

1.	Oxygen cylinders used for autogenous (cutting/welding) purposes are ___________________?
A.	Seamless & made of steel
B.	Heat treated before use
C.	Made by sand casting
D.	Welded steel cylinders
Answer» B. Heat treated before use

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Oxygen cylinders used for autogenous (cutting/welding) purposes are ___________________?

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