潜艇是一种既能在水面航行,又能潜入水下,在一定深度内进行活动的舰艇,是海军的重要作战兵器。现代潜艇依其动力装置的不同,分为核潜艇和常规潜艇。核潜艇诞生较晚,但其巨大的优势一度曾使常规潜艇黯然失色,发展几近停滞。然而,常规潜艇独具的特长:艇身小、机动灵活、噪音低及造价低廉,使其重新为各国海军所青睐。本文主要介绍二次世界大 A submarine is a naval vessel that can sail both on the water surface and submerged to carry out activities within a certain depth. It is an important naval combat weapon. Modern submarines according to their different power plant, divided into nuclear submarines and conventional submarines. The nuclear submarine was born later, but its huge advantage once made the conventional submarine eclipsed and its development nearly stagnant. However, the unique features of conventional submarines: small boat, flexible maneuvering, low noise and low cost make it favored by all navies. This article mainly introduces the second world big