A.cast iron has weakness
B.cast iron can stand up shock loading
C.cast iron fittings are only suitable in low pressure situation
D.east iron fittings are not suitable in low pressure situation
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A.east iron is a cheap material
B.cast iron can pollute sea water
C.cast iron has mere corrosive than bronzes to sea water
D.cast iron is more corrosive to sea water when it meets with bronzes
A.every six months
B.every year
C.every one and half year
D.every two years
A.foam extinguishers
B.water spray equipment
C.dry powder extinguishers
D.soda-acid extinguishers
A.deprival of oxygen
B.removal of heat
C.spraying of water
D.injecting of soda-acid
A.deprival of oxygen
B.a water spray
C.soda-acid
D.foam
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