1.

Which of the following display properties similar to that of steel? 1. Black-heart cast iron    2. White-heart cast iron 3. Gray cast iron             4. Pig iron                                      

A. 1 and 2 only                 
B. 3 and 4 only
C. 2 and 4 only                 
D. 1 and 3 only
Answer» B. 3 and 4 only


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