单项选择题
The Inmarsat SES operator can choose the most suitable CES according to（）.
A.his service and position B.time and course C.tide and speed D.type of his ship
单项选择题 The Network Coordination Station for the INMARSAT-A coast stations in the Pacific ocean region is in（）.
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（）.
