What is a lighted safe water mark fitted with to aid in its identification（）.<br>A:A spherical topmark<br>B:Red and white retroreflective material<br>C:A sequential number<br>D:A red and white octagon

What is a lighted safe water mark fitted with to aid in its identification（）.
A:A spherical topmark
B:Red and white retroreflective material
C:A sequential number
D:A red and white octagon

出自：海船船员证

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