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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(驾驶专业) > 航海英语 > 船舶货运技术 > 理货与计量作业

单项选择题

Green lights may appear on（）.

A.horizontally banded buoys
B.vertically striped buoys
C.yellow buoys
D.spherical buoys

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