单项选择题 A fluid coil will （） large quantifies of heat when it changes state from a vapor to a liquid.

单项选择题 A fluid coil will （） large quantifies of heat when it changes state from a liquid to a vapor.

单项选择题 What is the substance called which can readily be converted from a liquid into a vapor, and also from a vapor into liquid with a reasonably narrow range of pressure?（）