单项选择题
Every lifeboat which is fitted with a fixed（）VHF radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
A.one-way
B.two-way
C.double-effect
D.one-effect
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A.distress
B.urgent
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单项选择题
Every radio installation shall be clearly marked with the（）, the ship station identity and other codes as applicable for the use of the radio installation.
A.call sign
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