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- 4It takes (half an hour )to walk to school( 提问) ( ) ( ) ( )it take to walk to school
- 5江河湖海等所含的水的组成相同么?常见的氮肥中含氮的质量分数最高的是硫酸铵么?
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- 7化学对人类的贡献有哪些?
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- 9两个平行金属板中间夹一层绝缘物质就组成了电容器,那这个中间物质一定要和金属板接触吗
- 10什么成语的最后一个字是"猪"?