Give examples of crystalline solids and polycrystalline solids.
- ACrystalline: $NaCl$,$Quartz$; Polycrystalline: $Metals$
- BCrystalline: $Glass$,$Rubber$; Polycrystalline: $Plastic$
- CCrystalline: $Plastic$,$Glass$; Polycrystalline: $Quartz$
- DCrystalline: $Rubber$,$Plastic$; Polycrystalline: $NaCl$
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