单项选择题
Navigational marks used for informational or regulatory purposes are（）.
A.solid yellow
B.white with orange geometric shapes
C.red and white vertically-striped
D.green and red horizontally-banded
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单项选择题
Most totally enclosed lifeboats are equipped with which of the following? （）
A.Tanks for the storage of drinking water
B.Ballast tanks to prevent the boat from capsizing
C.A hydraulic start diesel engine
D.Auxiliary mechanical propulsion (Fleming gear) -
单项选择题
May I have a copy of the cargo plan?Certainly，here（）.
A.is it
B.are you
C.they are
D.you are -
单项选择题
Masts and derricks of cargo ships are made of（）.
A.steel
B.copper
C.bross
D.zinc
