短語詞組短語spool valve 短管閥casinghead spool 套管頭四通orientation spool 定位短節(jié)thread spool 線軸spool face 閥芯表面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