单项选择题

A supporting paragraph _____________ .
A、must have a topic sentence at the beginning
B、uses supporting materials to develop the topic sentence
C、can include points beyond what the topic sentence mentions
D、shows how you have proved your thesis

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问答题

在单纯的等分子反向扩散中,组分A的分压pA与扩散距离z应该呈________。

答案: 在单纯的等分子反向扩散中,组分A的分压pA与扩散距离z应该呈直线关系。
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