航海英语船员职务名称单项选择题每日一练(2018.12.15)

单项选择题
Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.
A.completely closing the compartment
B.closing the compartment except for the ventilators
C.leaving the compartment open to the air
D.increasing the air flow to the compartment by blowers
单项选择题
During the day，a vessel picking up a submarine cable shall carry（）.
A.three shapes，the highest and lowest shall be red balls，and the middle shall be a white diamond
B.two black balls
C.three shapes; the highest and lowest shall be black balls，and the middle shall be a red diamond
D.three shapes; the highest and lowest shall be black balls and the middle shall be a black diamond
单项选择题
During the day，a dredge will indicate the side on which it is safe to pass by displaying（）.
A.two balls in a vertical line
B.two diamonds in a vertical line
C.a single black ball
D.no shape is shown during the day
单项选择题
Each hand portable fire extinguisher on a ship must be marked with（）.
A.the name of the unit on which it is located
B.the date that it was installed on the unit
C.the names of the individuals qualified to use it
D.an identification number different from other extinguishers on the unit
单项选择题
During storm conditions on a ship，the mooring tensions should be adjusted so that（）.
A.all mooring lines have a different tension
B.the leeward lines have higher tension than the windward lines
C.the maximum tension of the most heavily loaded line does not exceed the safe working load
D.all horizontal tension forces on the windward lines are no greater than the vertical tension forces