單項選擇題

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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單項選擇題

"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

單項選擇題

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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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 （）.

你可能感興趣的試題

"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.

The soda-acid portable extinguishers must be discharged and refilled （）.

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精