Building Materials
The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is

Equal to 1
Less than 1
Less than 1 in beams but greater than 1 in channels
Greater than 1

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Building Materials
In the method of condensation polymerization,

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

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