• Out in the no-mans land of the international waters are the only means of communication with the submarines to use radio in the vlf or elf range.

    茫茫大洋深处,唯一可用通信手段就是甚低频或者极低频无线电

    youdao

  • Out in the no-mans land of the international waters are the only means of communication with the submarines to use radio in the vlf or elf range.

    茫茫大洋深处,唯一可用通信手段就是甚低频或者极低频无线电

    youdao

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