题目内容
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发布时间：2022年3月20日 23:59
[单项选择题]
The railroad industry could not have grown as large as it did without steel. The first rails were ma...According to the passage, how did the Bessemer method make the mass production of steel possible
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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