单项选择题
A towing light is a yellow light having the same characteristics as a(n)（）
A.special flashing light B.anchor light C.sternlight D.masthead light
单项选择题 A single towing light will be carried above a vessel’s sternlight（）.
单项选择题 A safe water daymark has what shape? （）
单项选择题 A red triangular daymark marks（）.
