Building Materials
The compound of Portland cement which contributes to the strength after two to three years is

Tri-calcium silicate
Di-calcium silicate
Tetra-calcium alumino ferrite
Tri-calcium aluminate

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Building Materials
A queen closer is a

Brick having the same length and depth as the other bricks but half the breadth
Brick laid with its breadth parallel to the face or direction of wall
Brick with half the width at one end and full width at the other
Brick laid with its length parallel to the face or direction of wall

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