单项选择题
What’s the advantage when using the satellites?（）
A.The message can be directed to the desired location
B.The message can follow the earth’s curvature
C.The quality of message can not be affected by climatic
D.The range of the message extend and the quality of reception is improved
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相关考题
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单项选择题
Any ships fitted with SES can（）and（）through the satellite system when sending a distress alert.
A.enter the system / contact an RCC
B.access to INMARSAT / establish contact with a CES
C.have absolute priority to enter the system / make contact with a CES
D.enter the system gradually / wait for rescue -
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 -
单项选择题
In which year was the COSPAS-SARSAT system established?（）
A.1980
B.1981
C.1979
D.1982
