单项选择题
Stations are grouped by countries arranged in the（）order of their country symbols.
A.alphabetical B.figure C.name of stations D.series
单项选择题 When engaged on international voyages, ships of 1600 tons gross tonnage and upwards shall be fitted with a（）.
单项选择题 The maritime access code of telephone mode in INMARSAT-A terminal for the AOR(W) is（）.
单项选择题 In Inmarsat-A, “Priority 0” means（）communication.
