单项选择题
Cast irons weakness in tension and under shock loading limits its use to low pressure steam, air, oil and low speed water fittingsThe above sentence, most probably means （）.
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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"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.
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 -
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The soda-acid portable extinguishers must be discharged and refilled （）.
A.every six months
B.every year
C.every one and half year
D.every two years -
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Class C fires are best extinguished by （）.
A.foam extinguishers
B.water spray equipment
C.dry powder extinguishers
D.soda-acid extinguishers
