A.Carbon dioxideB.Distilled waterC.Fresh waterD.Salt wa……

单项选择题Upon completion of fueling a gasoline driven vessel it is necessary to（）.

A.keep ports，doors，windows，and hatches closed
B.start engines immediately
C.ventilate before starting engine
D.None of the above

单项选择题There are（）rats on board.

A.not
B.no
C.any
D.none

单项选择题The vessel’s quarter is located（）.

A.abeam
B.dead astern
C.just forward of the beam on either side
D.on either side of the stern

单项选择题The use of liners in riveted construction is eliminated by using（）.

A.lapped construction
B.strapped construction
C.joggled construction
D.belted construction

单项选择题The upward slope of a vessels bottom from the keel to the bilge is called（）.

A.camber
B.sheer
C.rake
D.rise of bottom