该组合式机械三通密封的特殊设计使之能配合开孔机开出与管道内径相等的孔；

The special design of the tee branch is appropriate for drilling holes equal to the inner pipeline . diameters.

youdao

该组合式机械三通密封的特殊设计使之能配合开孔机开出与管道内径相等的孔；

The special design of the tee branch is appropriate for drilling holes equal to the inner pipeline . diameters.

youdao