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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

试题出自试卷《轮机部三管轮考试模拟题10(轮机英语)》

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Any carbon built up on surfaces must be washed away by _____ additives and held in suspension by a _____ additive.

Any carbon built up on surfaces must be washed away by _ additives and held in suspension by a _ additive.