Który z podanych w tabeli skład chemiczny zasypek krystalizatorowych należy zastosować w procesie odlewania, jeśli zasypka powinna mieć charakter zasadowy?<br> <br> Kryterium charakteru zasadowego: \( \frac{CaO}{SiO_2} > 1 \)<br> <br> <table><thead><tr><th rowspan="2" scope="col">Składniki zasypek krystalizatorowych</th><th colspan="4" scope="col">Skład chemiczny zasypek, %</th></tr><tr><th scope="col">A.</th><th scope="col">B.</th><th scope="col">C.</th><th scope="col">D.</th></tr></thead><tbody><tr><th scope="row">\( CaO \)</th><td>16,45</td><td>30,30</td><td>—</td><td>20,10</td></tr><tr><th scope="row">\( Al_2O_3 \)</th><td>5,01</td><td>4,31</td><td>11,50</td><td>5,80</td></tr><tr><th scope="row">\( MnO \)</th><td>0,02</td><td>3,06</td><td>—</td><td>—</td></tr><tr><th scope="row">\( MgO \)</th><td>1,54</td><td>0,60</td><td>—</td><td>1,90</td></tr><tr><th scope="row">\( Fe_2O_3 \)</th><td>—</td><td>2,36</td><td>4,00</td><td>< 1,5</td></tr><tr><th scope="row">\( FeO \)</th><td>0,54</td><td>—</td><td>—</td><td>—</td></tr><tr><th scope="row">\( TiO_2 \)</th><td>17,16</td><td>4,24</td><td>—</td><td>—</td></tr><tr><th scope="row">\( Na_2O \)</th><td>14,64</td><td>4,17</td><td>—</td><td>9,80</td></tr><tr><th scope="row">\( K_2O \)</th><td>0,66</td><td>0,51</td><td>—</td><td>< 0,1</td></tr><tr><th scope="row">\( SiO_2 \)</th><td>29,40</td><td>26,30</td><td>27,00</td><td>32,30</td></tr><tr><th scope="row">\( CaO + MgO \)</th><td>—</td><td>—</td><td>25,00</td><td>—</td></tr><tr><th scope="row">\( Na_2O + K_2O \)</th><td>—</td><td>—</td><td>5,50</td><td>—</td></tr><tr><th scope="row">\( Li_2O \)</th><td>—</td><td>—</td><td>—</td><td>< 0,3</td></tr><tr><th scope="row">F</th><td>—</td><td>—</td><td>6,00</td><td>6,00</td></tr><tr><th scope="row">C</th><td>6,49</td><td>21,40</td><td>20,00</td><td>23,60</td></tr></tbody></table>

• AB.
• BD.
• CC.
• DA.