Structural steel contains following principal alloying elements__________________?

A. aluminium
B. low carbon steel
C. medium carbon steel
D. high carbon steel
E. cast iron

A. high tensile strength
B. its elastic limit close to the ultimate breaking strength
C. high ductility
D. all of the above
E. none of the above

A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal