日本潜艇在“二战”时等级一般划分为1级至3级,1级潜艇的标准排水量为1000吨以上,2级潜艇的标准排水量为1000吨以下、500吨以上,3级潜艇的标准排水量为500吨以下,伊型潜艇属于1级潜艇,吕型潜艇属于2级潜艇,波型潜艇属于3级潜艇。日本的潜艇具有一个显著的特点,就是艇式繁多,除大、中、小型鱼雷攻击潜艇外,还有巡逻潜艇、布雷潜艇、运输潜艇和可携带1～3架飞机或袖珍潜艇的各类潜艇。由于日本海军一向比较重视 Japanese submarines in the “World War II” when the level is generally divided into 1 to 3, the standard submarine 1 displacement of 1000 tons and above, the standard submarine 2 submarine displacement of 1000 tons, 500 tons and above, the standard submarine 3 displacement of Under 500 tons, the submarine of Iraq is a submarine of Class 1, the submarine of Lu is a submarine of Class 2, and the submarine of wave submarine belongs to the third submarine. Japan’s submarine has a notable feature that is a variety of submarines, in addition to large, medium and small torpedo attack submarines, as well as patrol submarines, submarines, submarines and transport submarines can carry 1 to 3 aircraft or submarines of various types of submarines . As the Japanese Navy has always been more attention