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单体附加系（Monosomic additive line）
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特定成本计算的一般公式是（ ）。A.特定业务的单位成本=特定费用总额/特定业务工作量B.特定业务的单位成本=特定费用总额/（特定业务工作量+附加系数）C.特定业务的单位成本=特定费用总额/（特定业务工作量-附加系数）D.特定业务的单位成本=特定费用总额/特定业务工作量×附加系数
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What is a by-product of burned coal?A. Aluminum, silicon, and magnetic.B. Paving material.C. Fly ash.D. Concrete additive.
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检索钙（calcium）用于食品（food）或者饲料（feed）的添加剂（additive）的英文信息，检索式是：calcium and food or feed and additive
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单选题Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）A
Flash point improversB
Pour point improversC
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单选题Any carbon built up on surfaces must be washed away by （） additives and held in suspension by a （） additive.A
dispersant；detergentB
detergent；dispersantC
dispersant；dispersantD
detergent；detergent
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单选题An additive used to improve the ability of a lube oil to reduce friction is known as a/an （）.A
suppressant additiveB
dispersant additiveC
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名词解释题相加作用additive
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