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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