Building Materials
Three basic raw materials which are needed in large quantities for production of steel are

Iron ore, carbon and sulphur
Iron ore, carbon and lime stone
Iron ore, coal and lime stone
Iron ore, coal and sulphur

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Building Materials
The plywood

Can be spilt in the plane of the panel
Has good strength along the panel only
Has greater impact resistance to blows than ordinary wood
Cannot be bent more easily than ordinary wood of same thickness

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