问题
填空题
引起水泥体积安定性不良的原因是水泥中含有过多的游离氧化钙和______。
答案
参考答案：游离氧化镁
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引起水泥体积安定性不良的原因是水泥中含有过多的游离氧化钙和______。
参考答案：游离氧化镁
| 短文改错。 |
| Hi, I'm Jack. I study at Beijing Sunshine Secondary School. I'm in Class 1, Grade 7. I am come from England . 1. I lives on Spring Road. I'm clever at Maths. I have a cousin. 2. He is not very good at singing and dance. But he loves 3. listening to music. He has lots of CDs. He often listen 4. to them at the weekend. He also likes chatting with his friends. Would you like to make friends with he? 5. |