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
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相关考题
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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 -
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 -
单项选择题
A chart projection depicting the poles and a small area on either side of a connecting meridian，that is sometimes used for star charts，is the（）.
A.azimuthal gnomonic projection
B.Lambert conformal projection
C.transverse Mercator projection
D.polyconic projection
