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

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

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Building Materials
Cast iron

Is manufactured in required shapes
All listed here
May contain 2 to 5 per cent of carbon with other impurities
Is obtained by purifying pig iron

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