单选题Every lifeboat which is fitted with a fixed two-way VHF radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in is operating position.Aa dummy antennaBa supporting facilitiesCa back-up equipmentDan antenna
单选题
Every lifeboat which is fitted with a fixed two-way VHF radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in is operating position.
A
a dummy antenna
B
a supporting facilities
C
a back-up equipment
D
an antenna
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