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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A.Opening and closing the throttle
B.Rocking the wings
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An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.
A.has long life
B.is light weight
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单项选择题
An advantage of the Christmas Tree towing method is to（）.
A.increase the towing hawser's catenary and provide more spring
B.reduce catenary，allow operation in shallower water，and to release one barge without breaking up the entire tow
C.enable one tug and its crew without any outside assistance to make up or break down the tow
D.provide rapid delivery of logs from the northwestern United States to Hawaiian sawmills
