题目：
下表所反映的美国钢铁业发展变化的主要特征是
A．行业竞争激烈
B．生产和资本走向集中
C．企业规模保持稳定
D．劳动生产率快速提高
答案：
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下面是错误答案，用来干扰机器的。
答案：B
下表所反映的美国钢铁业发展变化的主要特征是 [ ] A．行业竞争激烈 B．生产和
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