propellant fraction propellant weight fraction propellant-weight ratio
Related Translations:
推进: 1.(推动工作, 使前进) push on; carry forward; advance; give impetus to 短语和例子推进改革与建设 promote reform and economic development; 把工作向前推进一步 carry the work a step forward; 把两国之间的友好关系推进到一个新阶段 carry the f