短语词组短語bucket main control valve 鏟鬭主控制閥backhoe bucket control valve 反鏟鬭控制閥multipurpose bucket control valve 多用途鏟鬭控制閥bucket control valve component 鏟鬭控制閥部件bucket control valve spool 鏟鬭控制閥滑閥 返回 bucket control valve