洗井管柱
参考答案：
清洗井底污物和转换井内流体的管柱。
You are a team star! Working with ____ is really your cup of tea. [ ]
A. both
B. either
C. others
D. the other
下列哪种成分的存在或缺失可以客观评价精神功能（）
A.BAEP
B.ERP
C.MEP
D.VEP
E.SEP
