A.deprival of oxygen
B.removal of heat
C.spraying of water
D.injecting of soda-acid
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A.deprival of oxygen
B.a water spray
C.soda-acid
D.foam
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
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