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【单选题】
根据STCW规则和海船值班规则的要求,航行船舶应随时保持正规的瞭望,并应达到下列目的:1探明遇难的船舶;2探明遇难的飞机;3探明遇难的人员;4探明沉船的残骸。A.
①②
B.
②③
C.
①②③④
D.
①③④
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B.
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A great deal of
D.
Many a
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