單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

In which year was the COSPAS-SARSAT system established?（）

A.1980
B.1981
C.1979
D.1982