单项选择题
After has permit the commissioning, the（）will permit the SES access to system.
A.INMARSAT B.IMO C.MSC D.CES
单项选择题 There are（）NCSs in total, one in each ocean region, the AOR (E and W), IOR and POR.
单项选择题 The NCC is located in the（）.
单项选择题 The GMDSS defines four sea area based on the（）.
