题目内容
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[主观题]
According to the passage, how did Bessemer method make the mass production of steel possib
le?
A.It directed air at melted iron in a furnace, removing all impurities.
B.It slowly heated iron ore then stirred it and heated it again.
C.It changed iron ore into iron which was a substitute for steel.
D.It could quickly find deposits of iron ore under the ground.
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