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[单选题]

 What is the function of the chillers in a traditional air-conditioning system?

A.They pump the air continuously to the units in each room.

B.They lower the temperature of the water in the system.

C.They help the water cool down naturally on the roof.

D.They gradually clean the water as it flows through the building.

参考答案与解析：

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    •  What is the function of the chillers in a traditional air-conditioning system?