单项选择题
A.cannot
B.are no allowed
C.have the right
D.should get permission to
单项选择题 What following is not among the functions of SOLAS ships?（）
单项选择题 Having studied the INMARSAT document, GMDSS document, SOLAS Convention and other international navigation documents, we all know that the Chapter IV of SOLAS Convention is mainly about（）.
单项选择题 According to the basic concept of GMDSS,（）can be rapidly alerted to a distress incident.