问题
判断题
硫、磷是碳钢中的有害杂质，前者使钢产生“热脆”，后者使钢产生“冷脆”，所以两者的含量在钢中应严格控制。
答案
参考答案：对
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硫、磷是碳钢中的有害杂质，前者使钢产生“热脆”，后者使钢产生“冷脆”，所以两者的含量在钢中应严格控制。
参考答案：对
| 用方框中所给短语的适当形式填空。 | |
2. David is leaving for Wenzhou _____. 3. _____, he has to travel to a country where English is not spoken. 4. Long long ago, many British people _____ to leave their country and brought the English language to other countries. 5. If you want to _____ studying English well, you need to do more listening and reading. |