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Which of the following methods is normally used to control the temperature of air distributed from individual cooling coils in an air conditioning system using a chilled water circulation system?（）
A:A room thermostat activates an electric heater at each individual chilled air outlet when necessary
B:Varying the number of passes the air makes across the coils
C:Varying the temperature of the water through the coils
D:Varying the quantity of water flowing through the coils

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出自：海船船员证

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