The cold working of metals is carried out_________________?
A. below the recrystallisation temperature
B. at the recrystallisation temperature
C. at any temperature
D. above the recrystallisation temperature…
A neutral flame is obtained by supplying___________________?
A. more volume of acetylene and less volume of oxygenB. equal volumes of oxygen and acetylene
C. more volume of oxygen and less volume of acetylene
D. none of the above…