一、二次泵冷水系统  chilled water system with primary-secondary pump

变流量一次泵水系统  variable primary flow chilled water system

定流量一次泵水系统  constant primary flow chilled water system

一二次水系统  primary and secondary water system

二次泵水系统  secondary pump system

一次泵系统  primary pump system

二次泵系统  primary-secondary pumping system; primary-secondary-pump system; secondary pump system; secondary-flow system; secondary pumping system

二冷水系统  secondary cooling water system

子系统次系统  subsystem

OPC统一系统平台  OPC unified system platform

电力系统一次调频  power system primary frequency control

电网时间统一系统  grid time unity system; time system for power grad

激光统一系统  Unified Laser TTC System

两成分系统一次动力学模式  first-order kinetic model of two-component system

时间统一系统  time synchronization system; Time-uniform System

统一系统  unified system

一次泵冷机变流量系统  SWV system of chillers with the primary pump

一次泵冷机定流量系统  VWV system of chillers with the primary pump

一次及二次系统  primary secondary system

一次水泵  primary pump