【判断题】膜分离法separation membrane利用气体各组分通过薄膜渗透性能的区别,将某种气体组分从气流中分离和提浓,达到脱酸气的目的。The gas components are separated and concentrated from the air flow by the difference of permeability through the film, so as to ach...
【简答题】Argnil Co is appraising the purchase of a new machine, costing $1·5 million, to replace an existing machine which is becoming out of date and which has no resale value. The forecast levels of producti...