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______ is not required by bridge-to-bridge communications．
A.VHF
B.SART
C.NAVTEX
D.LES
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which of the following can be used to develop the skill of listening for gist______.
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单选题The Vessel Bridge-to-Bridge Radiotelephone Act applies to which towboat?（）A
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单选题The radiotelephone required by the Vessel Bridge-to-Bridge Radiotelephone Act is for the exclusive use of （）.A
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单选题According to the “Vessel Bridge-to-Bridge Radiotelephone Act”，your radiotelephone log must contain（）.A
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to requireC
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