Truth: pumping air, quantitative fluoridated, had better add liquid, basically can solve.

正解：抽空气，定量加氟，最好加液态的，基本上可以解决。

youdao

Truth: pumping air, quantitative fluoridated, had better add liquid, basically can solve.

正解：抽空气，定量加氟，最好加液态的，基本上可以解决。

youdao