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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Los Angeles-class submarine ： ウィキペディア英語版 Los Angeles-class submarine The ''Los Angeles'' class (also known as the 688-class) is a class of nuclear-powered fast attack submarines (SSN) in service with the United States Navy. They represent two generations and close to half a century of the U.S. Navy's attack submarine fleet. As of late 2015, 39 of the class are still in commission and 23 retired from service. Of the 23 retired boats, 14 of them were laid up half way (approximately 17–18 years) through their projected lifespans due to their midlife reactor refuelings being cancelled. A further four boats were proposed by the Navy, but later cancelled. The class has more operating nuclear submarines than any other in the world. All submarines of this class are named after American towns and cities (e.g. Key West, Florida, and Greeneville, Tennessee), the exception being the . This system of naming broke a long-standing tradition in the U.S. Navy of naming attack submarines for creatures of the ocean (e.g. ). In 1982 after building 31 boats, the class underwent a minor redesign, the following 8 that made up the second "flight" of subs had 12 new vertical launch tubes that could fire Tomahawk missiles. The last 23 saw a significant upgrade with the 688i improvement program. These boats are quieter, with more advanced electronics, sensors, and noise reduction technology. Externally they can be recognized quickly as their retractable diving planes were placed at their bows rather than on their sails. ==Characteristics== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Los Angeles-class submarine」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.