短语词组短语spool valve 短管阀casinghead spool 套管头四通orientation spool 定位短节thread spool 线轴spool face 阀芯表面spool winding [电]模型绕组;模绕绕组;模型绕组Main Spool 主阀芯;以手动方法断定主圆轴Spool material 阀芯材质valve spool 滑阀；阀槽 返回 spool