A.be a stopperB.shorten a lineC.join lines of equal siz……

单项选择题A “fifteen-pound” CO2 extinguisher is so called because（）.

A.there are fifteen pounds of CO₂ in the container
B.the container，when full，weighs fifteen pounds
C.the pressure at the discharge nozzle is l5 psi
D.the empty container weighs fifteen pounds

单项选择题A “check” line is（）.

A.a safety line attached to a man working over the side
B.used to measure water depth
C.used to slow the headway of a barge
D.used to measure the overhead height of a bridge

单项选择题A “bowline” is used to（）.

A.join lines of equal size
B.form a temporary eye (loop) at the end of a line
C.be a stopper
D.keep a line from fraying

单项选择题“safe speed” is defined as that speed where（）.

A.you can stop within your visibility range
B.you can take proper and effective action to avoid collision
C.you are traveling slower than surrounding vessels
D.no wake comes from your vessel

单项选择题Deep-sea liners are（）.

A.ferries
B.passenger liners
C.cruise ships
D.ocean going vessels