Chemistry
Stainless steel is usually made by alloying the steel with

Manganese and copper
Copper and nickel
Chromium and nickel
Copper and chromium

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Tendency of carbon dioxide to form a layer along with dust smoke
Lack of oxygen in the surroundings of sigrees
Interrupted release of moisture from the material
Accumulation of smoke and dust over the sigrees

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