单选题Any carbon built up on surfaces must be washed away by （） additives and held in suspension by a （） additive.Adispersant；detergentBdetergent；dispersantCdispersant；dispersantDdetergent；detergent
单选题
Any carbon built up on surfaces must be washed away by （） additives and held in suspension by a （） additive.
A
dispersant；detergent
B
detergent；dispersant
C
dispersant；dispersant
D
detergent；detergent
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