问题
问答题 简答题
什么叫碳钢？什么叫铸铁？
答案
参考答案：
含碳量小于2％的铁碳合金称为碳素钢。含碳量大于2％的铁碳合金称为铸铁。
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什么叫碳钢？什么叫铸铁？
参考答案：
含碳量小于2％的铁碳合金称为碳素钢。含碳量大于2％的铁碳合金称为铸铁。
| 用方框中所给词（短语）的适当形式填空。 | |
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| 1. I am always busy working.l have less_______ time this year. 2. You look _______ in your new suit. 3. It's difficult for me to_______ him understand what I said. 4. _______the future can be difficult. 5. Last year,his dream_______;he went to the Great Wall. 6. Can you ________ your skirt to school? 7. The robots________ help people do all the work. 8. It's very hot today, Let's go________ 9. He works in ________ factory________I do. 10. It will be _______for us to walk on the moon one day. |