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1·The use of sulphurous acid in the manufacture of apple juice is prohibited.

硫磺酸，是不是目前在使用，硫磺酸在制造苹果汁的中是禁止的。

2·The result shows that after the plants were sprayed with phosphate buffer, they had an obvious protective function to the harm caused by sulphurous acid.

结果表明，植物经磷酸缓冲液处理后，对亚硫酸伤害具有明显的防护作用。

3·The chromatropic acid and magenta sulphurous acid methods for the formaldehyde determined by spectrophotometry are studied in this paper, and the two methods are compared.

本文研究了分光光度法测定甲醛中的变色酸法和品红亚硫酸法，同时对这两种方法进行了比较。