## 16. A very comfortable type of stairs is

## 17. If diameter of a reinforcement bar is d, the anchorage value of the hook is

## 18. If the length of a wall on either side of a lintel opening is at least half of its effective span L, the load W carried by the lintel is equivalent to the weight of brickwork contained in an equilateral triangle, producing a maximum bending moment

## 19. A foundation rests on

## 20. The effective span of a simply supported slab, is

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