head end短语¹³¹⁶²⁰⁺³ 基本例句 adj.起点的预备的 Second, it analyses the relation between the sag and the tension of the loose side chain at the head end unit of AFC, upon which the control system circuit was designed and the experiments was made. 其次分析了机头链轮松边链条的悬垂量与张力的关系，并在此基础上设计了控制系统电路并进行实验； cnki