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What is the MOST important thing you should do before transmitting on a marine radio? （）

A.Ask for permission
B.Record the time in your radio log
C.Press the push to talk button three times
D.Monitor the channel to insure that it is clear

單項(xiàng)選擇題

What is a “Special Warning”? （）

A.An urgent message concerning a vessel in distress
B.A weather advisory about unusual meteorological or oceanographic phenomena hazardous to vessels
C.A broadcast disseminating an official government proclamation affecting shipping
D.A radio navigational warning concerning a particularly hazardous condition affecting navigation