单项选择题
From IMO’S point of view, INMARSAT’s most important function is the provision of（）.
A.general radio communication B.MSI C.improved distress and safety communication D.bridge-to-bridge communication
单项选择题 （）is the united nations agency responsible for the Radio Regulations among other things.
单项选择题 The purpose of the GMDSS is to（）safety of life and property at sea all over the world.
单项选择题 The first communication satellite was used for the purpose of（）.
