单项选择题
This illustration shows the correct method of securing a（）.
A.man-rope
B.frapping line
C.sea painter
D.lifeline
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The Vessel can be（）in lawful trades between ports，anchorages or places where it is customary for similar size vessels to lie safely aground.
A.Permalloyed
B.Destroyed
C.Deployed
D.employed -
单项选择题
The use of sinking and dispersing chemical agents for removal of surface oil is（）.
A.the most common method used in the United States
B.too expensive for common use
C.generally safe to sea life
D.authorized only with prior approval of the Federal On-Scene Coordinator -
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The sprinkler system of an enclosed lifeboat is used to（）.
A.cool the craft in a fire
B.cool the engine
C.spray oil on the sea to calm it
D.spray personnel during a fire
