A.The chemicals they use sometimes pollute the water supply.
B.They often damage the buildings that they are trying to cool.
C.There are not enough CFCs in the world to cool all the buildings.
D.The method they use to cool water is thought to harm the ozone layer.
[单选题]What is the function of the chillers in a traditional air-conditioning syst
Not until this week were they aware of the problems with the air-conditioning un
[单选题]What was one problem of nitroglycerine?A.Office buildings could not be buil
Q2: What do we know about the air conditioning from the conversation？A. It was i
In an air conditioning system, moisture is removed from the air by________.A. fi
[单选题]It was 38 degrees and the air conditioning barelycooled the room.A.are the
In a chilled water air conditioning unit using a reciprocating compressor, the r
[单选题]What is NOT a function of the air supply of a covered lifeboat?（）A . Provides air for engine combustionB . Pressurizes water spray systemC . Provides air for passenger respirationD . Prevents smoke and other noxious fumes from entering craft
[单选题]What is the disadvantage for air transportation? （）A . Quick but not safeB . Less frequencyC . It can’t lift heavy goodsD . The highest cost in all transport modes
What is the problem with abandoned cares?A. They encourage homelessness.B. They