Building Materials
Slacking of lime is affected by

None of these
Immersing the lime in water
Keeping it exposed to air
Crushing the lime lumps

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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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