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预告信号 yùgào xìnhào
avia. prewarning signal
commun., railw. distant signal; approach signal
oil warning signal; anticipating signal
tech. offer signal
预告信号机 yùgào xìnhào
railw. forenotice signal; distant signal; mono indication distant signal; monoindication distant signal
预告信号【铁】 yùgào xìnhào
tech. distant signal
预告信号
: 19 phrases in 5 subjects
Aviation2
Communications6
Rail transport2
Shipbuilding1
Technology8

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