單項(xiàng)選擇題

Deficient oxygen content inside a chain locker can be detected with（）.

A.litmus paper
B.a combustible gas indicator
C.an oxygen breathing apparatus
D.an oxygen indicator

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Displacement refers to the（）.

A.cubic capacity of a vessel
B.deadweight carring capacity of a vessel
C.gross tonnage of vessel
D.number of long tons of water displaced by a vessel afloat

單項(xiàng)選擇題

Do not overtake.Vessel on（）2 miles distance will pass on my port side.

A.same course
B.opposite course
C.port side
D.starboard side