All of the following are DSC watch-keeping frequencies, except( )
A: . 2187.5 kHz.
B: 2182 kHz
C: 12577 kHz
D: 6312 kHz
A: . 2187.5 kHz.
B: 2182 kHz
C: 12577 kHz
D: 6312 kHz
B
举一反三
- 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
- ________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
- 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 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 MF frequencies is internationally allocated for use for transmitting NEVTEX-type broadcasts? A: 518 kHz using FEC mode. B: 4. 209. 5 kHz using FE mode. C: 486 kHz using FBC mode in China. D: All of the above.
内容
- 0
4: Which of the following frequencies is not used for GMDSS? A: 2182 kHz. B: 500 kHz. C: 518 kHz. D: 2187.5 kHz.
- 1
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
- 2
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
- 3
标准 CD 音频采样率是 A: 5 KHZ B: 11 KHZ C: 22 KHZ D: 44 KHZ
- 4
以下( )不是国际NAVTEX广播频率。 A: 490 kHz B: 518 kHz C: 4209.5 kHz D: 486 kHz