reserve radiotelegraph installation的意思|示意

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辅助无线电信设备

辅助无线电信设备 ... 辅助通风 assisted draught 辅助无线电信设备 reserve radiotelegraph installation 辅助蒸汽 auxiliary steam ...

备用无线电报设备 ... 备用泵 reserve pump 备用无线电报设备 reserve radiotelegraph installation 备用收信机 reserve receiver ...