81. The yield strength and tensile strength of low carbon steel may be improved by the addition of
82. Commonly used thinner in
83. Which of the following trees yields hard wood?
84. The practical limit of moisture content achieved in air drying of timber is
85. Which of the following represents a metamorphic rock?
(i) Slate
(ii) Shale
(iii) Quartzite
(i) Slate
(ii) Shale
(iii) Quartzite
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