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

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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題The term OIL as used in the Oil Pollution Regulations means（）.

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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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