The air is （）. Don’t enter that area.

单项选择题Post two lookouts with （）.

A.sextant
B.compass
C.radar
D.binoculars

单项选择题Fire in the cabins. Close all fire doors and use the （）powder extinguisher.

A.dry
B.wet
C.foam
D.portable

单项选择题After joining the ship, the crew members should be （）with their emergency duties.

A.know
B.familiarize
C.familiar
D.familiarity

单项选择题Take off fore and aft boat （）.

A.plugs
B.nests
C.davits
D.covers

单项选择题Put all the fire-fighting equipment back in place and （）them away.

A.take
B.keep
C.stow
D.let