Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?（）

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• Which of the listed statements is correct concerning refrigeration systems?（）

  A . Dehydrators must be used continuously in a refrigeration system B . A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours C . A thermostatic expansion valve is used to control refrigerated space temperature D . The liquid receiver functions to collect and remove non- condensable gase

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• Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）

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• Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）

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• Which of the listed statements is correct concerning the starting of centrifugal pumps?（）

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• Which of the listed bearing types is an example of a solid bearing?（）

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• In which of the listed refrigeration system components does superheating of the refrigerant take place?（）

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• Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）

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• Using the LIST command in Recovery Manager (RMAN), which two pieces of information in the RMANrepository can be listed?（）

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• Which of the following answer choices are correct characteristics of named access list?（）

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• Which of the following statements is false about the relationship of causes, problems and effects?

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• Which of the following country may have serious problems of counterfeit medicine（）

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