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Restricted areas at locks and dams are indicated b...

海船船员考试

单选题

Restricted areas at locks and dams are indicated by（）.

发布日期：2021-03-22

A.flashing red lights upstream and fixed red lights downstream

B.yellow unlighted buoys

C.signs and/or flashing red lights

D.red daymarks upstream and green daymarks downstream

标签： restricted areas locks dams

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