Ifthereisafireonboard,informthebridgeandgivethe（）atonce. A: sound B: sounding C: alarm D: signal
Ifthereisafireonboard,informthebridgeandgivethe（）atonce. A: sound B: sounding C: alarm D: signal
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Ifthereisafireonboard,informthebridgeandgivethe（）atonce. A: sound B: sounding C: alarm D: signal