Restricted areas at locks and dams are indicated by（）.<br>A:Flashing red lights upstream and fixed red lights downstream<br>B:Yellow unlighted buoys<br>C:Signs and/or flashing red lights<br>D:Red daymarks upstream and green daymarks downstream

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

出自：海船船员证

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