【单选题】【消耗次数：1】
第二次工业革命时期，最重大的成就是（ ）。
①
煤炭的使用
②
电力的使用
③
火车的发明
④
钢铁的使用
参考答案：
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改革是中国的第二次革命的原因在于（）。
①
A 改革是为了扫除发展生产力的障碍，解放生产力
②
B 改革是对原有体制进行根本性的变革，而不是修补
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