单项选择题
When receiving a distress alert, the SAR authorities ashore and the ships in the vicinity of the ship in distress will（）in a coordinated search and rescue operation with the minimum delay.
A.assist B.send a rescue vessel C.search the distress area D.reach the distress position at once
单项选择题 In areas covered by Inmarsat HF can be used as an（）to satellite communications.
单项选择题 With the help of GMDSS（）can be alerted to a distress incident as soon as possible.
单项选择题 The Inmarsat system is open for use by（）countries on a non-discriminatory basis.
