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
点击查看答案&解析
相关考题
-
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
