Add 5 ml. concentrated sulphuric acid to 100 ml. water sample and shake well.

把大约5亳升的浓硫酸加进100亳升的水样本中，混匀。

youdao

Add 5 ml. concentrated sulphuric acid to 100 ml. water sample and shake well.

把大约5亳升的浓硫酸加进100亳升的水样本中，混匀。

youdao