[网络] 弹簧回位阀 return valve spring: 回动阀弹簧; 回流阀簧spring return directional valve: 弹簧复位的换向阀spring-return directional valve: 弹簧复位的换向阀hydraulic relay valve return spring: 液压式继动阀回动弹簧single solenoid spring return valve: 单螺旋弹簧回位阀下载手机词典可随时随地查词查翻译