土壤学 - 2026 进行中

科目: 土壤学
级别: XI
类别: 大学生
测试题目: 英语
问题示例: A soil has a cation-exchange capacity of 36 cmol(+) kg⁻¹, of which 9 cmol(+) kg⁻¹ are occupied by exchangeable magnesium. What is the magnesium saturation? 12.5%, 20%, 30%, 25%