The chip-tool and chip-work interfaces are exposed to such conditions that adhesive and abrasion wear is very common.

The properties of cast irons are as follows except . A: good castability B: poor mechanical properties C: good abrasion resistance D: poor machinability

The advantages of cotton include: A: high level of moisture absorption B: moderate strength ,good abrasion resistance •and good dimensional stability C: resists sunlight and heat well D: soft hand feel