单项选择题
Before GMDSS, if the radio officer on board is serious ill,（）.
A.someone else will take his place B.the captain will take charge of his work C.nobody will be capable of doing his work D.anyone else will use the radio equipment
单项选择题 What following is not among the function of SOLAS ships?（）
单项选择题 SOLAS ships shall be equipped with（）.
单项选择题 Please use（）for（）.
