Absorption refrigeration cycle can be driven by low-grade thermal energy, such as solar energy, geothermal energy and wa......

利用热天平和电镜研究六种煤在温度低于500℃氮气流中加热的性质变化，研究表明：煤变质程度对其失重变化影响大；随升温速率的提高，煤颗......