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A facility used for the discharge of a cargo of a particular hazard，such as chlorine，butane or ethane，must have what to warn water traffic of an immediate danger during fire or cargo release?（）
A:An emergency boat and crew
B:A siren or rotating flashing light
C:Flashing red lights located one-half mile upstream and downstream of the facility
D:Buoys with flashing lights controlled from shore，located one-half mile upstream anddownstream of the facility

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出自：海船船员证

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