A.deprival of oxygen
B.a water spray
C.soda-acid
D.foam
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A.combustible material
B.ignition source
C.oxygen
D.A and B and C
A.Two derricks
B.A derrick and a crane
C.Two cranes
D.A crane and a winch
A.360°
B.270°
C.180°
D.90°
A.less
B.more
C.many
D.much
A.a warp end
B.a mooring winch
C.a worm gear
D.a barrel
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