Building Construction
In a colar beam roof

There are two horizontal ties, one at the feet and other at the middle of the rafters
There is a horizontal tie at the feet of rafters only
There is no horizontal tie beam
There is a horizontal tie at almost the middle of rafters only

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Building Construction
Slate

Has a smooth surface and contains alumina and silica
Possesses good water absorption capacity
Splits into thin sheets along its bedding planes
Is a metamorphic rock

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