题目内容
离子交换主要是对水中的钙、镁离子的去除，多用在水的软化和脱盐等领域。
查看答案
搜索结果不匹配？点我反馈
更多问题
To be up to the job, you need to go through ________ trainings in expertise.
He has been a ________ to the pop star’s charm.
As the best player in the team, he is ________ to its struggle for the national champion.
If you ________ yourself to pleasures, you are less likely to make something of you in life.
微信支付 
支付宝支付