A.to be destroyed B.to be demolished C.to be ruined D.to be spoiled
A.fix B.running fix C.estimated position D.dead-reckoning position
A.They mark the limits of breakers in that area B.These lines warn the mariner of submerged rocks C.They mark the boundary lines of fish trap areas D.These lines warn the mariner of submerged pipelines
A.start the engine in cold weather B.aid in helping personnel breathe C.prime the sprinkler system D.prime the air supply
A.should never use radar bearings B.should only use radar bearings when the range exceeds the distance to the horizon C.can use radar information from one object to fix the position D.must use information from targets forward of the beam
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