单项选择题

A.ofB.onC.atD.inThe transmission of messages respecting……

The transmission of messages respecting the dangers specified is free（）cost to the ships concerned.

A.of
B.on
C.at
D.in

<上一题目录下一题>

热门试题

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（）.

A.fuel oil
B.sludge
C.oil refuse
D.All of the above

单项选择题The radiotelephone safety message urgently concerned with safety of a person would be prefixed by the word（）.

A.Mayday
B.Pan
C.Safety
D.Interco

单项选择题The radiotelegraph alarm signal is（）.

A.SOS sent three times
B.ten one-second dashes with a four-second interval between them
C.twelve four-second dashes with a one-second interval between them
D.twelve one-second dashes with a short interval between them

单项选择题The expression FIRST MAGNITUDE is usually used to refer only to bodies of magnitude（）.

A.1.5 and greater
B.1.25 and greater
C.1.0 and greater
D.0.5 and greater