Chalk or _____ may be used to rub on the surface of rough castings as a marking material.

Chalk or _____ may be used to rub on the surface of rough castings as a marking material.

Chalk or _____ may be used to rub on the surface of rough castings as a marking material.




a. Aluminum sulphate
b. Grinding compound
c. Soap stone
d. Blue vitriol
e. Wax






Answer: C


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