题目内容：
我国南方大部分土壤中的磷酸盐主要是什么。
A.钙磷酸盐
B.有机磷酸盐
C.铁铝磷酸盐
D.镁磷酸盐
参考答案：
选择题：我国南方大部分土壤中的磷酸盐主要是什么。
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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