单选题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?（）.AA flashing amber lightBA fixed red lightCA white flag raised and lowered verticallyDA flashing white light
单选题
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
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