primary secondary tertiary steel







Industry | Britannica

Primary industry tends to dominate the economies of undeveloped and developing nations, but as secondary and tertiary industries are developed, ... steel and iron ...


Economic sector - Wikipedia

Economic sector. This figure ... less of their economies operating in the primary and secondary sectors and more ... be workers in the secondary sector.) Tertiary: ...






Strength of ships - Wikipedia

The strength of ships is a ... The total load on a particular section of a ship's hull is the sum total of all primary, secondary, and tertiary ... This steel has a ...


















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