单项选择题
A.Factor of safety B.Number of wires per strand C.Number of strands per wire rope D.Number of wires in the core
A CO2 extinguisher on a ship which has lost 10% of its ...
单项选择题A CO2 extinguisher on a ship which has lost 10% of its charge must be（）.
A.used at the earliest opportunity B.hydro-tested C.recharged D.weighed again in one month
A chart with a scale of 1:80，000 would fall into the ca...
单项选择题A chart with a scale of 1:80，000 would fall into the category of a（）.
A.sailing chart B.general chart C.coastal chart D.harbor chart
A chart with a natural scale of 1:160，000 is classified...
单项选择题A chart with a natural scale of 1:160，000 is classified as a（）.
A.sailing chart B.general chart C.coast chart D.harbor chart
