单项选择题
It is quite（）for an SES operator to send a distress alert.
A.easy and expensive
B.simple and certain
C.dangerous and stable
D.difficult and compulsory
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相关考题
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单项选择题
In which year was the COSPAS-SARSAT system established?（）
A.1980
B.1981
C.1979
D.1982 -
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.
A.alternation
B.alternate
C.alter
D.alternative
