145) Which is not one of the stress – strain relations? a) semi-elastic b) elastic and full plastic c) elastic and stiffening d) fully elastic 146) Which one cannot be gray cast iron? A) Alloy containing 4% Si B) Alloy containing 3% Si C) Alloy containing 1% Si D) Alloy containing 2% Si E) Alloy containing 1.5% Si 147) Which is the most abundant element in the earth’s crust and used in material making? A) aluminum B) silicon C) iron D) copper E) oxygen
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