单项选择题
The towing light is a(n)（）.
A.flashing amber light B.yellow light with the same characteristics as the sternlight C.all-round yellow light D.yellow light with the same characteristics as the masthead light
单项选择题 The term OIL as used in the Oil Pollution Regulations means（）.
单项选择题 The radiotelephone safety message urgently concerned with safety of a person would be prefixed by the word（）.
单项选择题 The radiotelegraph alarm signal is（）.
