Which of the following frequencies is not used for DSC service A: 829lkHz B: 8414.5 kHz C: 16804.5 kHz D: 4207.5 kHz
Which of the following frequencies is not used for DSC service A: 829lkHz B: 8414.5 kHz C: 16804.5 kHz D: 4207.5 kHz
符合GMDSS要求,配备MF/HF设备的船舶应在()DSC频率上保持连续值守. A: 2182/2187.5 B: 2174.5/8291 C: 2187.5/8414.5 D: 4207.5/8414.5
符合GMDSS要求,配备MF/HF设备的船舶应在()DSC频率上保持连续值守. A: 2182/2187.5 B: 2174.5/8291 C: 2187.5/8414.5 D: 4207.5/8414.5
根据要求,配备MF/HF设备的船舶应在( )DSC频率上保持连续值守。 A: 2187.5/4207.5kHz B: 2187.5/8414.5 kHz C: 4207.5/8414.5 kHz D: 6312/12577 kHzD
根据要求,配备MF/HF设备的船舶应在( )DSC频率上保持连续值守。 A: 2187.5/4207.5kHz B: 2187.5/8414.5 kHz C: 4207.5/8414.5 kHz D: 6312/12577 kHzD
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