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- 两级SBRTSSBR
- 两级SBR工艺处理小城镇生活污水研究REASEACH ON TREATMENT OF SMALL TOWN WASTE WATER BY TWO-STAGE SBR PROCESS
- 两级SBR工艺除磷脱氮自动控制实验研究The Experimental Research on Phosphorus and Nitrogen Removal in Two-stage SBR Process by Automatic Control
- 两级SBR工艺two-stage SBR process
- 两个two
- 三级SBRThree-stage SBR process
- 三级SBR法除磷脱氮研究Discussion on Three-stage SBR Process for Phosphorus and Nitrogen Removal
- 两级two-stage
- 三级SBR除磷脱氮工艺处理生活污水Domestic Sewage Treatment Using Three-stage SBR Denitrification and Phosphorus Removal Process
- 他是耶鲁大学比我高两级的学生。He was my senior at Yale by two years.
- 两级系统a two-tiered system
- 他一次跑上两级阶梯。He ran up the steps two at a time.
- 两级过滤double-filtration
- 两级管理制a two-tier system of management
- 两级法two step method
- 两级OTAtwo stage OTA
- 两级制two- level system
- 两级环two-level-loops
- 两级DBFtwo-step DBF
- 两级泵two-stage pump
