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VHF Radio is one of the very important navigational instruments on board，（）messages can be sent.
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VHF Radio is one of the very important navigational instruments on board，（）messages can be sent.
A、by which
B、through which
C、by that
D、through that
时间：2022-01-03 11:28
关键词：
GMDSS
答案解析
B
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