问题
问答题 简答题
简述建组的条件。
答案
参考答案：
1）岩性相对一致（均一、夹层、互层、成因相关或特别复杂）；
2）内部结构较一致；
3）顶底界线明显，可以是不整合界线或明显的整合界线，组内不能有不整合界线；
4）一定厚度和分布范围（一般要求能在1/5万-1/20万区域地质图上表达）。
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简述建组的条件。
参考答案：
1）岩性相对一致（均一、夹层、互层、成因相关或特别复杂）；
2）内部结构较一致；
3）顶底界线明显，可以是不整合界线或明显的整合界线，组内不能有不整合界线；
4）一定厚度和分布范围（一般要求能在1/5万-1/20万区域地质图上表达）。
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| I have two friends. 1 names are Lucy and Lily. They 2 from Canada. They 3 English. My English is poor. They often help me 4 English at home. I help them 5 their Chinese. We help 6 other. They are twins (双胞胎). They 7 the same. We are in the same grade, but we are in different 8 . I like 9 and they like me. They have a pet. It is a cat. 10 name is Mimi. We like it very much. | ||||
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