21. The radial splits which are wider on the outside of the log and narrower towards the pith are known as
22. A wooden block fixed on back side of a door frame on its post, is known as
23. A projecting piece usually provided to support a truss, is
24. The dimensions of a half queen closer, are
25. The concrete slump recommended for foundations, is
26. The vertical side member of a shutter frame, is known
27. Couple close roof is suitable for maximum span of
28. An ordinary concrete may be made water proof by adding
29. The vertical posts placed at the top and bottom ends of a flight supporting the hand rail are known as
30. In ordinary residential and public buildings, the damp proof course is generally provided at
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