单选题As defined in the Rules，a towing light is a yellow light having the same characteristics as a(n)（）.Amasthead lightBall-round lightCsidelightDsternlight
单选题
As defined in the Rules，a towing light is a yellow light having the same characteristics as a(n)（）.
A
masthead light
B
all-round light
C
sidelight
D
sternlight
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