单项选择题
A.can fit any size hose B.converts a stream of water into a fog C.increases the amount of water reaching the fire D.can spray two streams of water at the same time
A.a vessel is equipped with an automatic smoke or fire detecting system B.the cargo hatches are of steel construction C.the cargo is of a nonflammable type D.there is sufficient fire protection located on the main deck adjacent to the cargo hatch
A.To replace a damaged life preserver B.For use during fire drills C.For use during boat drills D.At no time