4: Which of the following frequencies is not used for GMDSS?
A: 2182 kHz.
B: 500 kHz.
C: 518 kHz.
D: 2187.5 kHz.
A: 2182 kHz.
B: 500 kHz.
C: 518 kHz.
D: 2187.5 kHz.
举一反三
- All of the following are DSC watch-keeping frequencies, except( ) A: . 2187.5 kHz. B: 2182 kHz C: 12577 kHz D: 6312 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
- ________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
- 国际NAVTEX系统使用的专用频率是____。（ ） A: 500 kHz B: 518 kHz C: CH16 D: 4 210 kHz