Building Materials
Proper amount of entrained air in concrete results in
(i) Better workability
(ii) Better resistance to freezing and thawing
(iii) Lesser workability
(iv) Less resistance to freezing and thawing

(i) and (iv)
(iii) and (iv)
(ii) and (iii)
(i) and (ii)

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Building Materials
Sapwood consists of

Thin fibre which extends from the pith outwards and holds the annular rings together
Thin layers below the bark
Innermost annular rings around the pith
Portion of timber between heartwood and cambium layer

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