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

Crystalline
Non-crystalline solid
Rubberry
Non-crystalline organic polymeric

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Materials and Construction
Lead pipe is

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

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