single-stringCOCA³¹⁵¹¹¹⁺⁴BNC²³⁶²¹³⁺¹ 基本例句 🌏全单串；单吸离心泵 Based on the dynamic analysis of lifting process of single-string pig lift, the mathematical model of single- string pig lifting process has been established. 基于单管球塞气举举升过程动力学分析，建立了单管球塞举升过程数学模型； lib.swpu.edu.cn