恒压过滤参数的测定:恒压过滤时,如何保证溶液的浓度不变?
参考答案:
①把抽滤瓶中的水倒回滤浆槽中。②及时补充点清水。③滤渣(滤饼)必须倒回滤浆槽中。
Choose and correct the mistakes. 把错误的选项填在括号内并在横线上改正。
( )1. Danny eat ice cream yesterday.
A B C
( )2. I often talks to Miss Li.
( )3. I cann't see a dog over there.
( )4. This is for your.
( )5. Danny jump on the train.
法洛四联症的并发症有( )、( )、( )。