Building Materials
In the method of condensation polymerization,

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

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Building Materials
Sapwood consists of

Thin fibre which extends from the pith outwards and holds the annular rings together
Portion of timber between heartwood and cambium layer
Innermost annular rings around the pith
Thin layers below the bark

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