题目内容

The word energy can have many different applications，such as when one speaks of the amount of energy (stamina) children have.

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The refrigeration system in the central plant of a central system is usually in the form of a heater package with an outdoor condensing unit.

For energy transport, the heat capacity of air is about 3 400 times greater than that of water.

An individual air-conditioning system normally employs either a single, self-contained, packaged room air conditioner (installed in a window or through a wall) or separate indoor and outdoor units to serve an individual room.

If the ultimate chemical analysis is known, approximate heat values can be determined for all of the coals.