根据我国船舶升挂旗管理办法的规定,下列有关船舶升挂旗的叙述哪些正确?( ) 1船舶取得中国国籍后第一次升挂中国国旗时可举行升旗仪式 2中国国籍改变国籍最后一次降中国国旗时可举行降旗仪式 3中国遇难时,船长应指定专人降下国旗并携带离船 A. ①②③ B. ②③ C. ①③ D. ①②
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