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The burning of the fuel adds more heat to the air charge, causing it to expand and force t
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Which of the listed effects represents the purpose of heat treating steel？A.Develop ductil
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Each cylinder is closed at the top by a _____, made of a special heat－resistant steel.A.cy
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The iron and steel industry ______ an important part in our national economy.A．playsB．play
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Whats the main industry of Bedford？A．Coal.B．Iron and steel.C．Car.D．Education.
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It is time we（)computers to the production of iron and steel. A. will apply B. appl
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When a material burns in the air, heat is released and new substances are______.A．separate
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