题目内容
世界贸易大约________的运输量，是通过海上进行运输。About ______of the world's trade is transported by ships at sea.
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截止2017年年底全世界大约有________船员。At the end of 2017, there were about ______ sailors worldwide.
我国沿海航区的船长、驾驶员、轮机长和轮机员可分为________The competency certificates of Masters, deck Officers, Chief Engineers and Engineers for coastal navigation areas in China are classified as_______.
Based on the perspective of responsibility, the functions of seafarers include the ________. 按责任级别，船员可分________
The management level ensures that all functions within the designated area of responsibility are properly performed. The corresponding ranks include______ 管理级指保证正规地履行指定责任范围内的所有功能有关的责任级别，对应的职务包括________
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