It frequently changes during smelting and roasting.
It may change when artifacts are buried for thousands of years.
27. It can be inferred from the passage that the use of flux in processing copper ore can alter the lead isotope composition of the resulting metal EXCEPT when
there is a smaller concentration of lead in the flux than in the copper ore
the concentration of lead in the flux is equivalent to that of the lead in the ore
some of the lead in the flux evaporates during processing
any lead in the flux has the same isotopic composition as the lead in the ore
other metals are added during processing
答案:17-27:DBBBBADEDAD
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