The high activity of the oleums is helpful for enhancing the sulfonation degree of the sulfonated bodies.

发烟硫酸活性高，有助于提高磺化物的磺 化度。

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The high activity of the oleums is helpful for enhancing the sulfonation degree of the sulfonated bodies.

发烟硫酸活性高，有助于提高磺化物的磺 化度。

youdao