The composition of common glass is:

  • A
    $Na_2O \cdot CaO \cdot 6SiO_3$
  • B
    $Na_2O \cdot Al_2O_3 \cdot SiO_2$
  • C
    $CaO \cdot Al_2O_3 \cdot SiO_2$
  • D
    $Na_2O \cdot CaO \cdot 6SiO_2$

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