The unit of heat energy commonly used in physics is the________.

The essential part of the diesel engine, whose function is to convert the heat energy into the mechanical power, is the _____.

As a heat engine, （) energy is the source of power by which a diesel enginecan be operate

_____ the compression ratio, _____ the proportion of the heat energy of the combustion tur

For many people in the United States who are concerned about the cost of heating homes and

A．How amber changes shape when heated.B．How clear amber is.C．How common is around the

The energy______by the chain reaction is transformed into heat.A．releasedB．relievedC．revea