单项选择题

An all-round flashing yellow light may be exhibited by a(n)（）.

A.vessel laying cable
B.vessel towing a submerged object
C.vessel not under command
D.air cushion vessel

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单项选择题
An airplane should NOT send which signal in reply to a surface craft?（）

A.Opening and closing the throttle
B.Rocking the wings
C.Flashing the navigational lights off and on
D.Flashing Morse T
单项选择题
An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.

A.has long life
B.is light weight
C.absorbs shock
D.has fine adjustment
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