航海英语船员职务名称单项选择题每日一练(2017.11.14)

单项选择题
During the manufacture of line，yarns are twisted together in the（）.
A.opposite direction from which the fibers are twisted together to form strands
B.same direction the fibers are twisted to form strands
C.opposite direction from which the fibers are twisted together to form the line
D.opposite direction from which the fibers are twisted together forming cables
单项选择题
Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.
A.six weeks
B.six months
C.twelve months
D.two years
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
A certificated lifeboatman assigned to command the lifeboat should（）.
A.be the first individual to board the craft
B.drain the hydraulic pressure before lowering the craft
C.have a list of the persons assigned to the lifeboat
D.All of the above
单项选择题
During a period of “whiteout”，you should expect which of the following?（）
A.Snowfall or blowing snow
B.Lack of ability to estimate distance
C.Harsh contrast between sun-illuminated snow cover and the background
D.Hazy horizons with extensive mirage effects