问题
填空题
工业用钢按化学成分可分为（）和（）二大类。
答案
参考答案：碳素钢；合金钢
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工业用钢按化学成分可分为（）和（）二大类。
参考答案：碳素钢；合金钢
| 用方框中所给单词的适当形式填空，每词限用一次。 | |
2. Take the bus, and you will get to the university in five ______. 3. All of the children had a ______ school trip to the mountain. 4. I heard the ______ news that there was an accident on wall street this morning. 5. The river ______ again after the storm yesterday. |