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

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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
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