问题
问答题 简答题
如何减少铸坯振痕？
答案
参考答案：
振痕深度与结晶器负滑脱时间有关，负滑脱时间越短，振痕深度越浅，因此铸机可采用高频低幅的办法来减少振痕深度，改善铸坯表面质量。
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如何减少铸坯振痕？
参考答案：
振痕深度与结晶器负滑脱时间有关，负滑脱时间越短，振痕深度越浅，因此铸机可采用高频低幅的办法来减少振痕深度，改善铸坯表面质量。
句子改错：下列每个句子中均有一处错误，请指出并改正。
| 1. Does he wants to be teacher? | |
| A B C | |
| 2. My work is a kind of dangerous. | |
| A B C | |
| 3. She is a policewoman, it's an exciting work. | |
| A B C | |
| 4. What are your parents do? They are workers. | |
| A B C | |
| 5. Miss White is a famous actor. | |
| A B C | ______ |
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