单项选择题
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（）.
单项选择题 The sprinkler system of an enclosed lifeboat is used to（）.
单项选择题 The sea painter of a rescue boat should be led（）.
