问题
判断题
铸铁热焊时白口化严重。
答案
参考答案：错
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铸铁热焊时白口化严重。
参考答案：错
| 方框填词 | |
2. His grandpa is now 75 years old. He has lived in Qingdao ______. 3. _____ taking exercise, I prefer playing volleyball. 4. What does your brother want to be when he ____? 5. The children are old enough _____ themselves. |