A.Poly(vinyl chloride)
B.Polystyrene
C.Polytetrafluoroethylene
D.Polyimide
A.Poly(vinyl chloride)
B.Polystyrene
C.Polytetrafluoroethylene
D.Polyimide
A、asphalt tile
B、smooth wood
C、vinyl asbestos
D、cement
______ is not a structural adhesive.
A) casein
B) urea-formaldehyde
C) phenol-resorcinol-formaldehyde
D) poly (vinyl acetate)
A、key word(s) in title: catalyst and "polyvinyl chloride"
B、key word(s) in title or abstract: catalyst and "polyvinyl chloride"
C、key word(s) in title: catalyst and ("polyvinyl chloride" or PVC)
D、key word(s) in title or abstract: catalyst and ("polyvinyl chloride" or PVC)
The amount of chloride content in the water of an auxiliary boiler can be reduced by .
A.adding hydrazine
B.blowing down the boiler
C.adding phenolphthalein
D.adding a sulfite chloride scavenger
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