试题与答案

有效渗透率的概念是什么?其表示符号是什么?

题型:问答题 简答题

题目:

有效渗透率的概念是什么?其表示符号是什么?

答案:

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    ________ ________ go to the Great Wall?

3. She doesn't know where she should go.(改为简单句)

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