________是无线电话遇险与安全通信频率。 A: 2187.5 MHz B: 2187.5 kHz C: 2182 KHz D: 2174.5 kHz
________是无线电话遇险与安全通信频率。 A: 2187.5 MHz B: 2187.5 kHz C: 2182 KHz D: 2174.5 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
4: Which of the following frequencies is not used for GMDSS? A: 2182 kHz. B: 500 kHz. C: 518 kHz. D: 2187.5 kHz.
4: Which of the following frequencies is not used for GMDSS? A: 2182 kHz. B: 500 kHz. C: 518 kHz. D: 2187.5 kHz.
All of the following are DSC watch-keeping frequencies, except( ) A: . 2187.5 kHz. B: 2182 kHz C: 12577 kHz D: 6312 kHz
All of the following are DSC watch-keeping frequencies, except( ) A: . 2187.5 kHz. B: 2182 kHz C: 12577 kHz D: 6312 kHz
使用无线电传进行现场通信的频率是()KHZ A: 2174.5 B: 2182 C: 2187.5 D: CH16
使用无线电传进行现场通信的频率是()KHZ A: 2174.5 B: 2182 C: 2187.5 D: CH16
NBDP遇险与安全通信所使用的中频频率是_____KHz。 A: 2182 B: 2177 C: 2174.5 D: 2187.5
NBDP遇险与安全通信所使用的中频频率是_____KHz。 A: 2182 B: 2177 C: 2174.5 D: 2187.5
. Which of the following frequencies is as international distress and safety frequencies on MF for radio telephone? A: 2187.5 kHz B: 2174.5 kHz C: 2182kHz D: 2177. OkHz
. Which of the following frequencies is as international distress and safety frequencies on MF for radio telephone? A: 2187.5 kHz B: 2174.5 kHz C: 2182kHz D: 2177. OkHz
对于航行在A1海区的船舶,所必须强制值守的频率是() A: 121.5MHZ B: 2187.5 MHZ C: 156.525MHZ D: 8414.5 MHZ
对于航行在A1海区的船舶,所必须强制值守的频率是() A: 121.5MHZ B: 2187.5 MHZ C: 156.525MHZ D: 8414.5 MHZ