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
[单选题]What was one problem of nitroglycerine?A.Office buildings could not be buil
[单选题]It was 38 degrees and the air conditioning barelycooled the room.A.are the
[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
[单选题]Unlike more traditional embedded systems,a full-fledged CPSis typically des
[单选题]What is the main problem lied in the ship recycling industry?A.It lies in the sustainable developmentB.It is about how to recycle the ship as they can as possibleC.It is a big problem concerning environment, safety and healthD.The big problem is that
[单选题]What is NOT a problem area when loading barges on a LASH type vessel? ()A . Frequent stability calculations requiredB . Thorough pre-planning requiredC . Limiting depths alongside berths restrict barge draftsD . Minimum trim and 0°list are requir
[单选题]A.ccording to Paragraph 3,one problem with the policy is that it may____.[A]discourage students from doing homework[B]result in students' indifference to their report cards[C]undermine the authority of state tests[D]restrict teachers' power in educ
[单选题]What is the effect of heated intake air on a diesel engine? ()A . Increases efficiencyB . Increases engine horsepowerC . Increases engine lifeD . Reduces engine horsepower