Which one of the following is used to make 'non- stick' cookware?....
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Which one of the following is used to make 'non-
\( \mathrm{P} \)
stick' cookware?
W
(1) PVC
(2) Polystyrene
(3) Poly (ethylene terephthalate)
(4) Polytetrafluoroethylene
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