Kemija - 2017. jesen, 20.

A. $\mathrm{Al}_{2} \mathrm{O}_{3}$

B. $\mathrm{CaO}$

C. $\mathrm{MgO}$

D. ${\mathrm{P}}_4{\mathrm{O}}_{10}\backslash mathrm\{P\}\_\{4\}\; \backslash mathrm\{O\}\_\{10\}$