The most important purpose of frog in a brick is to :

1.	The most important purpose of frog in a brick is to :
A.	emboss manufacturer's name
B.	reduce the weight of brick
C.	form keyed joint between brick and mortar
D.	improve insulation by providing 'hollows'.
Answer» D. improve insulation by providing 'hollows'.

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The most important purpose of frog in a brick is to :

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