When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

A. Copper and zinc B. Copper and tin C. Copper, tin and zinc D. None of these

A. Make the steel tougher and harder B. Raise the yield point C. Make the steel ductile and of good bending qualities D. All of the above

A. 0.05% B. 0.15% C. 0.3% D. 0.5%

A. Linear B. Nonlinear C. Plastic D. No fixed relationship