1) secondary sand-filter
二级沙滤
1.
The peper introduced such improvements as increasing foam-separate device in the heated pond, the aerated foam Purifying device, lamp of biological effect and the secondary sand-filter pond, thus enhancing the standard of water quality, eminating part of bacteria in water, raising the seed-emerged rate perunit water body and the economic benefit.
在扇贝育苗场的工程设计中，通过增加加热池的泡沫分离装置、充气的泡沫净化装置、生物效应灯及二级沙滤池，提高了水质标准，除去水中部分细菌，提高了单位水体出苗率和经济效益。
2) 2 grade filtration
二级过滤
1.
Through the particle concentration analysis at the several points in traditional 3 grade series filtration system and the new 2 grade series filtration system and the cleaning effect analysis of the two systems,the feasibility,economics and simplicity of the 2 grade filtration treatment used are verified, the conditions and the new air treatment method for th.
通过对传统的三级过滤净化系统及新型的二级过滤净化系统内各点处浓度的分析及净化效果的分析，证明了二级过滤处理在中小型净化空调系统中应用的可能性、经济性和简单性，并指出了采用这一系统的前提条件和对新风的预处理方法。
3) secondary filter
二级滤池
4) dual-step ultrafiltration system
二级超滤系统
1.
Treatment of soybean whey with dual-step ultrafiltration system;
二级超滤系统处理大豆乳清
5) two-stage filter model
二级滤波模型
6) dual-step ultrafiltration membrane system
二级超滤膜系统
补充资料：沙滤
1.使水通过沙粒层把所含杂质分离出去。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条