Building Materials
The type of arch generally constructed over a wooden lintel or over a flat arch for the purpose of carrying the load of the wall above is

segmental arch
relieving arch
pointed arch
flat arch

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Building Materials
When a brick is immersed in water for 24 hours and then dried, if

10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
All listed here
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
No grey or white deposits appear on the surface, the brick is free from soluble salts

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