VHF radio is one of the very important navigational instruments on board,（）messages can be sent.<br>A:by which<br>B:through which<br>C:by that<br>D:through that

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

出自：海船船员证

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