Materials
Pipe (Fluid Conveyance) / Liquids
Paint / Manmade Materials
Crystallography / Crystal
Plastic / Amorphous Solid
Valve / Building Engineering
Chemical Compounds / Chemical Substances
Rock (Geology) / Industries
Disinfectant / Sterilization (Microbiology)
Printed Circuit Board / Soldering
Reinforced Concrete / Concrete
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