Building Materials
The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as

Open hearth process
Crucible process
Cementation process
Bessemer process

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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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