Building Materials
Pick up correct statement from the following:

Fibre boards are used for thermal and acoustic control
Fibre boards are used for light weight standing members
Fibre boards are obtained by impregnating a resin product on fibres
All listed here

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Building Materials
In the method of condensation polymerization,

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

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