Building Materials
In the method of condensation polymerization,

Low-molecular substances are removed from the high molecular substance
All of these
The reaction proceeds with an evolution of ammonia
The reaction proceeds with an evolution of hydrogen chloride

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Building Materials
Asbestos

Contains iron oxide and alumina
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
All of these
Is a natural fibrous mineral substance

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