短语词组短語spool valve 短琯閥casinghead spool 套琯頭四通orientation spool 定位短節thread spool 線軸spool face 閥芯表麪spool winding [電]模型繞組;模繞繞組;模型繞組Main Spool 主閥芯;以手動方法斷定主圓軸Spool material 閥芯材質valve spool 滑閥；閥槽 返回 spool