A drawbridge may use visual signals to acknowledge a vessel’s request to open the draw. Which signal indicates that the draw will NOT be opened immediately?（）<br>A:A flashing amber light<br>B:A fixed red light<br>C:A white flag raised and lowered vertically<br>D:A flashing white light

A drawbridge may use visual signals to acknowledge a vessel’s request to open the draw. Which signal indicates that the draw will NOT be opened immediately?（）
A:A flashing amber light
B:A fixed red light
C:A white flag raised and lowered vertically
D:A flashing white light

出自：海船船员证

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