These include a need for further large-scale trials, official approval of the product in several countries, and a relatively short shelf-life in its normal ready-to-spray liquid form.
The other is the use of hybrid drive, liquid - gas or electro - hydraulic hybrid drive, only suitable for specific occasions, there is no large-scale use.
其它还有采用混合驱动，即液-气或电-液混合驱动等，只适用于特定场合，没有大规模采用。
3
In this paper, the preparation method of chlorine dioxide steady liquid in lab scale and the factors affecting cotton bleaching with orthogonal experimental method are discussed.