Gmdss_e3 : Element 3 - 451/605
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| What is a frequency standard? |
| A) A well-known (standard) frequency used for transmitting certain messages. |
| B) A device used to produce a highly accurate reference frequency. |
| C) A device for accurately measuring frequency to within 1 Hz. |
| D) A device used to generate wide-band random frequencies. |
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