真理和谬误在一定条件下可以转化的论断是（）
A、辩证唯物主义观点
B、相对主义观点
C、诡辩主义观点
D、经验主义观点
参考答案：A
用所给词的适当形式填空。
1. I can't find the museum. What should I ___________ (do)?
2. I need some more money ___________ (pay) for my child's education.
3. Could you ___________ (pass) me those books?
4. My parents want me ___________ (stay) at home every night.
5. Mother's Day is coming, but I'm not sure what ___________(buy) for my mother.
海水淡化装置产水含盐量太大，下列措施错的是（）。
A.加大给水量
B.减少加热水流量
C.降低盐水水位
D.稍开真空破坏阀
