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当前学科：城乡规划相关知识
题目：
单选题
能源转化过程中最容易产生污染的环节是以下（）环节。
A
次生源转化为再生能源的过程
B
二次能源的输送、贮存、使用过程
C
开采原生能源
D
将原生能源转化为次生能源的过程
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