Nanjing Traditional Metal Material Mass Customization

Analysis: (1) According to the concept of alloy and the composition and properties of steel, it can be judged that steel is alloy;

(2) In order to avoid the corrosion of the hull steel shell, according to the law that the metal with strong activity is corroded first, it is judged that the metal embedded in the hull steel shell is more active than iron.

(1) alloy is a metallic material formed by the fusion of metal with other metals or nonmetals, and steel is an alloy of iron and metal formed by the fusion of iron and carbon.

(2) According to the contact of two metals with different activities in a humid environment, the metal with strong activity is corroded first. Among the four metals of silver, copper, tin and zinc, zinc is more active than iron. It can be known that in order to avoid the corrosion of the steel hull of a ship, zinc with stronger metal activity than iron is usually embedded in the hull; So choose d;

So the answer is: (1) alloy; (2)D。