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【单选题】
新建油船设置专用压载舱的优点是________。1防止海洋污染;2减轻货油舱结构腐蚀;3提高强度、抗沉性;4缩短在港时间;5增加了油船的有效载货舱容;6增加船体重量及造价A.
①②③⑤⑥
B.
①②③④⑤⑥
C.
②③④⑤⑥
D.
①②③④
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