题目内容

Why do some stations keep silence?

A. Because they are not engaged in the distress traffic
B. They will affect the transmission of that distress traffic
C. The powers of these stations are very weak
D. They are not in charge of search and rescue

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A. the radio regulations
B. the technical terms and definitions
C. how to operate the GMDSS SES equipment
D. Maritime Communications

A. constructs
B. constructed
C. has constructed
D. was onstructed

A. 2182KHz
B. 2174.5KHz
C. 2191KHz
D. 2187.5KHz

A. routine
B. distress
C. urgency
D. safety