单项选择题
A spanner is a（）.
A.cross connection line between two main fire lines
B.special wrench for the couplings in a fire hose line
C.tackle rigged to support a fire hose
D.none of the above
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相关考题
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单项选择题
A long splice in a line（）.
A.is used in running rigging
B.doubles the size of the line
C.is only used on fiber rope
D.is very weak -
单项选择题
A hook that will release quickly is a（）.
A.longshore hook
B.margin hook
C.marginal hook
D.pelican hook -
单项选择题
（）should not be considered as components as fire installations.
A.fire pumps
B.fire mains
C.hydrants and hoses
D.closing appliances which are kept permanently closed at sea
