Building Materials
In the method of condensation polymerization,

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

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Building Materials
The plywood

Has good strength along the panel only
Has greater impact resistance to blows than ordinary wood
Cannot be bent more easily than ordinary wood of same thickness
Can be spilt in the plane of the panel

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