Engineering Materials
A material is known as allotropic or polymorphic if it

Has a fixed structure under all conditions
Responds to heat treatment
Exists in several crystal forms at different temperatures
Has its atoms distributed in a random pattern

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Engineering Materials
The charge of the blast furnace consists of

Calcined ore (1 part), coke (8 parts) and limestone (4 parts)
Calcined ore, coke and limestone all in equal parts
Calcined ore (4 parts), coke (1 part) and limestone (8 parts)
Calcined ore (8 parts), coke (4 parts) and limestone (1 part)

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