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자가오염()
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자가오염(Water-borne pollution)
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자건품()
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자기발연신호(Self-Activating Smoke Signals)
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자기점화등(Self-igniting Lights)
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자기컴파스(Magnetic Compass)
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자동조타장치(Auto Pilot)
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자동추적장치(ATA : Automatic Tracking Aid)
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자동추적장치(ATA : Automatic Tracking Aid)
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자동충돌 예방보조장치(Automatic Radar-Plotting Aids)
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