Adopt filter paper to be filter material.

采用滤纸作为过滤材料。

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The teacher gave each of us a piece of filter paper before doing the experiment.

做试验前，老师给我们每个人发了一张滤纸。

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Method: Filter paper test.

方法：滤纸法。

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Method: Filter paper test.

方法：滤纸法。

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