单项选择题
Fire hose should be washed with（）.
A.salt water and a wire brush B.caustic soap C.mild soap and fresh water D.a holystone
单项选择题 Fire hose couplings（）.
单项选择题 Fire fighting equipment requirements for a particular vessel may be found on the（）.
单项选择题 Fire extinguishing agents used on Class C fires must be（）.
