分类：社会民生-军事
问题：美国一共建造服役了多少艘淡水鲤级潜艇? 
美国一共建造服役了多少艘淡水鲤级?
回答：Tench class淡水鲤级 

Initial plans called for 146 to be built, but 115 were cancelled in 1944 and 1945 when it became apparent that they would not be needed to defeat Japan. 

淡水鲤级原计划建造146艘,但1944和1945年,115艘被取消建造,
原因是明显不需靠它们来打败日本。

共建造31艘

SS-478: