Reduce the informality of this sentence, and re-write the new sentence in the box.Q8: There isn’t very much research on the use of oil palm shell as coarse aggregate in the production of concrete.
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【简答题】(8分)X、Y、Z三种常见的短周期元素可以形成XY 2 、Z 2 Y、XY 3 、Z 2 Y 2 、Z 2 X等化合物,已知Y的离子和Z的离子有相同的电子层结构,X离子比Y离子多一个电子层。试回答: (1)写出X、Y、Z三种元素的符号和名称: ; (2)分析Z 2 Y 2 中含有的化学键类型: ; (3)写出Z 2 Y 2 与二氧化碳反应的方程式: ; (4)用电子式表示X和Z两元素形成化合物的过...
【单选题】Section B Directions: In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only ...