Timber defects can divided into 4 categories. Choose two right answers below.
Unnatural defects
Seasoning defects
Conversion defects
Defersion defects
Fire can cause _______ to timber.
Charring
Fading of co;our
Exit hole
Superficial discolouration
How many percent carbon of the dry wood of timber ?
100%
79%
50%
86%
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