Which of the following accurately describes the meaning of redundant cooling？（） A: The source of cooling to a RAID system B: The cooling system in a redundant power supply C: A cooling system that can be installed in case of failure D: A second cooling system in case of a failure

__________ are<br/>manmade water bodies that offer once-through cooling<br/>pollution. () A: Artificial<br/>Lake B: Cooling towers C: Spray ponds D: Cooling ponds

Birds orient themselves carefully with regard to the sun and gently ________ their wings to increase convection (气流对流) cooling.

In the closed cooling system， the water （）.

The main jobs of the _________ are lubricating, cooling, cleaning and sealing. A: radiator B: oil filter C: engine oil D: cooling fan

It is necessary to remove （） from the cooling spaces.

For<br/>1080 steel, normalizing is a heat treatment obtained by austenitizing<br/>and ____ cooling. A: air B: furnace C: water D: oil

Do they have ____________ air-conditioners for cooling the rooms in summer?

Cooling the intake air supplied to a diesel engine will （）.

The cooling liquid used for the cylinder may be referred to as （）.