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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 > 海上通信 > GMDSS

单项选择题

It is quite（）for an SES operator to send a distress alert.

A.easy and expensive
B.simple and certain
C.dangerous and stable
D.difficult and compulsory

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