acidulous cation-exchange resin的用法和样例：
- The sodium is removed with cation exchange resin.
- The sodium is removed with cation exchange resin .
- The reaction adopted strong-acid cation exchange resin catalysed phthalic anhydride and butyl alcohol.
- We used cation exchange resin to separate the free vincristine sulfate from the liposomes.
- In the mean while, the sample was transformed with cation exchange resin, the molar ratio of sufate ions to carboxylate ions was determined.