The outer-bodydiameter of the plunger is cut just under production tubing drift to provide the maximum seal while the plunger moves fr eely.
当柱塞自由移动时,柱塞的外体直径刚好能够满足生产油管内径密封需求,提供最大的密封保障。
2
Limb skin temperature may be surprised to discover the parents, extensive congenital arteriovenous fistula, can cause bodydiameter, growth, along with the children and increasingly obvious.