Frogs made in the bricks are
ATo reduce the weight of the brick
BTo form a key for holding the mortar
CTo indicate year and name of manufacture
DTo indicate the top of the brick
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Related Questions:
The commonly used lime mortar for white washing:
The lime that has a high calcium oxide content and is dependent for setting and hardening solely on the absorption of carbon dioxide from the atmosphere
The mortar in which both cement and lime are used as binding materials is called:
Duration of hydration of cement lasts
Standard size of brick