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问题详情

An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.

A、sound signal

B、light signal

C、visual signal

D、radiotelephone

时间：2022-01-04 02:06 关键词：液化天然气操作工

答案解析

D

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