科学家预言 ,以氢为燃料的飞机有可能在本世纪初飞上蓝天。德国戴勒姆—奔驰·空中客车公司正在研制这种飞机。这种飞机的最大优点是不排放温室气体二氧化碳 ,而且排出的氮氧化物也比普通的飞机要少。飞机制造商们过去已试验过比普通燃料更轻的氢燃料。 195 6年 ,美国军方让一 Scientists predict that hydrogen-fueled aircraft may fly into the sky at the beginning of this century. Germany’s Dalem-Benz · Airbus is developing this aircraft. The biggest advantage of this aircraft is that it does not emit carbon dioxide, a greenhouse gas, and emits less nitrogen oxides than an ordinary aircraft. Aircraft manufacturers have in the past tested hydrogen fuels lighter than conventional fuels. 195 six years, the U.S. military made one