What is a lighted safe water mark fitted w
题型：单项选择题
问题：
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
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