a dilute acid的用法和样例：
- After the sample is dissolved by CC14, the starch in the sample is allowed toenter into water phase by heating and refluxing with a dilute acid in the water bath.
- In early purifications of this type, antibody was eluted with dilute acid or base.
- It is superior to sodium silicate cement in impermeability, resistance to dilute acid and cohesive strength.
- Algae and lichens can be removed with a dilute ammonia solution.