1. A wooden block hinged on post outside a door, is known
2. The window which is provided in flat roof of a room, is known
3. Weep holes are provided in retaining and breast walls
4. The triangular space formed between the extrados and the horizontal line drawn through the crown of an arch is known as
5. The vertical distance between the springing line and highest point of the inner curve of an arch is known as
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