Select the single and two-phase material systems from the list below. Briefly explain your selections. 1. Solid ductile cast iron (ferrite solid solution + embedded graphite spheres) 2. Solid sodium chloride (salt, NaCl) 3. Liquid bronze (Cu + Sn liquid solution) 4. Solid gray cast iron (ferrite solid solution + embedded graphite flakes) 5. Solid aluminum featuring dissolved silicon 6. Solid lead-tin solder (a mixture of Pb-rich and Sn-rich solid solutions) 7. Partially melted aluminum 8. Frozen water with trapped air bubbles 9. Epoxy embedded with carbon fibers