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当前学科：水土保持防治工
题目：
单选题
水土保持综合调查的主要内容包括自然条件调查、自然资源调查、社会经济调查、水土流失调查和（）等五个方面。
A
人口调查
B
土壤侵蚀调查
C
水土保持现状调查
D
人为水土流失调查
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