Materials and Construction
The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.

Rubberry
Non-crystalline organic polymeric
Non-crystalline solid
Crystalline

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Materials and Construction
Lead pipe is

All of these
Especially resistant to solutions containing H₂SO₄
Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
Usually joined by burning (e.g. by melting to adjacent pieces with a torch)

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