单选题Which statement about transmitting distress messages by radiotelephone is INCORRECT?（）ADistress messages should first be transmitted on 2182 kHzBIt is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds durationCIf no answer is received on the designated distress frequencies，repeat the distress call on any frequency availableDChannel 16 (156.8 MHz) may be used for distress messages
单选题
Which statement about transmitting distress messages by radiotelephone is INCORRECT?（）
A
Distress messages should first be transmitted on 2182 kHz
B
It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration
C
If no answer is received on the designated distress frequencies，repeat the distress call on any frequency available
D
Channel 16 (156.8 MHz) may be used for distress messages
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