SOLAS ships_to stand by on channel 16
A、
has been required/in 1984
B、
has been required/before 1984
C、
are required/in 1984
D、
has been required/since 1984
发布时间：2025-06-26 15:10:18
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B、
C、
D、
推荐参考答案 (
由 快搜搜题库 官方老师解答 )
答案：D
