Greenhill L M. Balancing low cost with reliable operation in the rotordynamic design of the ALS liquid hydrogen fuel turbopump. AIAA 90-2741.是什么意思_Greenhill L M. Balancing low cost with reliable operation in the rotordynamic design of the ALS liquid hydrogen fuel turbopump. AIAA 90-2741.在线翻译_英语_读音_用法_例句