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The following substances belong to the alloy () A. Flour B. Stainless steel C. Activated carbon D. Dali.
A, there is no metal substance in flour, not alloy; All wet.
B, stainless steel is iron, chromium and nickel alloy; So, right.
C, activated carbon is a simple substance, which belongs to purity; All wet.
D, the main component of marble is calcium carbonate, not alloy; All wet.