Materials and Construction
Visco-elastic behaviour of materials which is time dependent is common in

Crystalline solid
Non-crystalline solids
Plastics
Non-crystalline organic polymer

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Materials and Construction
Wrought iron is

High carbon iron
Malleable & ductile; and hence is used for chain links, hooks & couplings
Highly resistance to acid corrosion
An alloy of iron, chromium & carbon

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