gas fired unit heater是什么意思

用法例句

Industry standard composition principles and general technology features of vehicle gas-fuel heater;

行业标准《汽车燃气加热器》编制原则与主要技术特点

Research on emission control of vehicle fuel-fired air heater;

汽车燃油空气加热器燃烧排放控制研究

Noise property of vehicle fuel-fired air heater;

汽车燃油空气加热器噪声性能