BOTH
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Some common insulators include glass, rubber, plastic, ceramic, and wood. These materials are used to prevent the flow of electricity and heat.
apple apricot
Rubber, glass, plastic, ceramic, air, quartz, paper, wood, bakelite, porcelain.
Greengrocer
apple
* Orange
· nectarine
pear, peach
Grapes and plums
lemon and melon