热机工作时，通过燃烧将燃料的________能转化为内能。为了提高燃料的利用率，设法利用________ 的能量是一条重要的措施。
化学；废气
He his post because he hatl been offered a better job. [ ]
A. resigned
B. retired
C. dismissed
D. fired
麦冬是百合科植物，学名为Ophiopogon japanicus。
