There are many reasons for a needing a fifth auxiliarycomponent called the Controller. Some of these reasons are.
需要第5个辅助组件Controller的原因有很多，这是其中的一些。
2
The invention comprises a main agent and an auxiliarycomponent; the main agent component is aluminum potassium sulfate or aluminium ammonium sulfate.
本发明包括主剂和辅剂成份，主剂成份为硫酸铝钾或硫酸铝铵。
3
Curved diffuser is an important auxiliarycomponent of main fan installations of mine, whose performance directly influences the operating efficiency of the installations.