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.
单项选择题 The vessel’s quarter is located（）.
单项选择题 The use of liners in riveted construction is eliminated by using（）.
