A.contaminated
B.emulsified
C.deteriorated
D.oxidated
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A.additives
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A.thermal
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C.plastic
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If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
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To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.